# What is the kinetic energy of a 29 kg dog that is running at a speed of 7.9 m/s (about 18 mi/h)?

45,322 questions, page 54
1. ## Physics

A uniform solid sphere of mass 4kg and diameter 20cm initally at rest, begins to roll without slipping under the influece of gravity, down an incline that makes an angle of 15degrees to the horizontal 1 calculate the angular acceleration of the sphere 2

asked by Dermot on August 7, 2010
2. ## Physics

Real world trampolines lose energy since they are damped springs with much internal friction. How much energy does the sumo wrestler lose on each bounce in this situation? Information I was given: mass=400 kg gravity=10N/kg k = 12000 N/m I also know from

asked by Charlotte on February 6, 2016
3. ## Physics

The temperature in an electric oven is 165°C. The temperature at the outer surface in the kitchen is 55°C. The oven (surface area = 1.6 m2) is insulated with material that has a thickness of 0.023 m and a thermal conductivity of 0.045 J/(sm°C). a) How

asked by papito Urgent help needed on April 18, 2007
4. ## PHYSICS

#1.) If the force of gravity on a human is 539 N determine the mass of the human. #2.) Draw a free body diagram for the following situation: a.) A 0.15 kg running shoe is pushed to the right, with a constant velocity, across a wet concrete floor with an

asked by AMANDAAA on February 3, 2013
5. ## Grammar

predication 1. The reason for the cat's illness is because she was allergic to the dog. 2. The driving exam is when one is tested on he rules of the road. The cat's allegy to the dog caused her illness. Using "is because" and "is when" makes very awkward,

asked by Helen on August 13, 2007
6. ## physics

A vehicle expends an energy of 25000J while moving at a constant speed of 5 ms.what is the mass of vehicle?

asked by nitya on April 6, 2015
7. ## Science

A 60-kg cheetah reaches a speed of 30m\s as it chases its prey. What is the kenetic energy of the cheetah?

asked by Serafina on February 14, 2017
8. ## physics

A set of crash tests consists of running a test car moving at a speed of 11.6 m/s (25.52 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 61 kg (134.2 lbs) dummy is found to move a distance of 0.69 m from the moment the car

asked by Tsion on February 12, 2014
9. ## physics

A 3.6 kg wood block is launched up a wooden ramp that is inclined at a 30¡ angle. The block's initial speed is 13 m/s. (Use µk = 0.20 for the coefficient of kinetic friction for wood on wood.) What vertical height does the block reach above its starting

asked by help me on October 25, 2010
10. ## Physics

A 2.0kg wood block is launched up a wooden ramp that is inclined at a 26 angle. The block's initial speed is 8.0 m/s. The coefficient of kinetic friction of wood on wood is 0.200. a) What vertical height does the block reach above its starting point?

asked by senko on October 10, 2012
11. ## Physics help

A 31.0 kg child on a swing reaches a maximum height of 1.92 m above their rest position. Assuming no loss of energy: a) At what point during the swing will she attain their maximum speed? b) What will be her maximum speed through the subsequent swing? c)

asked by Help me in Physics on January 11, 2016
12. ## Chemistry

Activation energy is____ the heat released in a reaction*** the energy barrier between reactants and products the energy given off when reactants collide generally very high for a reaction that takes place rapidly

asked by Annamarie on May 12, 2016
13. ## sci

You are a board member of your Home Owner’s Association. At your next meeting, your goal is to educate other homeowners about energy conservation. Review the following Energy Resource Plan outline: Introduction: Provide information about why conserving

asked by Anonymous on February 7, 2010
14. ## physics

A proton is projected at a stationary 6238 Ni aluminum target. The proton momentarily comes to a halt at a distance from the center of an aluminum nucleus, equal to twice the nuclear radius. Assume that the nucleus retains its spherical shape and that the

asked by jay on March 30, 2016
15. ## Chemistry

Activation energy is the heat released in a reaction the energy barrier between reactants and products the energy given off when reactants collide*** generally very high for a reaction that takes place rapidly

asked by Jacob on May 16, 2016
16. ## Chemistry

if 9560 J of energy were absorbed by 25.0g of ice at 0 degrees Celsius what would be the final temperature? First you must calculate the energy required to melt ice completely. With the remaining energy (Q). This is the equation i came up with but i'm not

asked by Sage on February 24, 2016
17. ## Physics

A free nuetron can decay into a proton, an electron, and a neutrino.Assume the neutrino's rest mass is zero, and the rest masses for proton and electron are 1.6726*10^-27 kg and 9.11*10^-31 kg. Determine the total kinetic energy shared among the three

asked by Jenish on April 14, 2008
18. ## physics

The plates of a parallel plate capacitor are separated by a distance of 1.2cm, and the electric field within the capacitor has a magnitude of 2.1x 10^6 V/m. An electron starts from rest at the negative plate and accelerates to the positive plate. What is

asked by H on July 10, 2008
19. ## HELP I DON'T UNDERSTAND THIS QUESTION !

Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house.Then describe the ideal energy source for generating most of your home's electricity and explain why you chose

asked by kelsey on May 19, 2014
20. ## science

Earth's energy sources include both renewable and nonrenewable resources. name at least three sources of energy that could be used in your house. then describe the ideal energy source for generating most of your home's electricity, and explain why you

21. ## Physics

The energy of the nth excited state of a hydrogen atom is proportional to 100 - (100/n2). 1) Using this formula, calculate the energy of the first five energy states. 2) How many spectral lines are possible for the transition of a photon in the n= 5 state

asked by CGUFF on April 14, 2008
22. ## Science

"Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house. Then describe the ideal source of energy for generating most of your home's electricity, and explain why you

asked by Priscilla on April 17, 2015
23. ## Science

Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house. Then describe the ideal energy source for generating most of your home's electricity, and explain why you

asked by kathryn on May 16, 2018
24. ## physics

A disk with mass m = 8.1 kg and radius R = 0.33 m begins at rest and accelerates uniformly for t = 18 s, to a final angular speed of ω = 34 rad/s. What is the angular acceleration of the disk? What is the angular displacement over the 18 s? What is the

asked by stewart on November 3, 2014
25. ## Physics

A disk with mass m = 9.8 kg and radius R = 0.31 m begins at rest and accelerates uniformly for t = 18.7 s, to a final angular speed of ω = 31 rad/s. a. What is the angular acceleration of the disk? b. What is the angular displacement over the 18.7 s? c.

26. ## Physics- due tomorrow

Two wires have current both running in the positive x direction as shown in the diagram with I1 = 13.9 amps and I2 = 4.5 amps. They are separated by a distance of d = 4.7 meters. A third wire with I3 = 10 amps is placed somewhere between the two wires with

asked by Justin on March 24, 2010
27. ## physics

Starting from rest, a 10kg suitcase slides down a 3.00m long ramp inclined at 30 degrees from the floor. The coefficient of friction between the suitcase and the ramp is 0.35. 1) what net force is applied to the suitcase while it is on the ramp? 2)what is

asked by jared on December 13, 2015
28. ## Physics 20 Energy

A 85kg skydiver falls from an altitude of 3.5 X 10^3 M to an altitude of 1.10 X 10^3 m at constant speed.What is her change in potential energy?

asked by Abdurhman on January 21, 2017
29. ## math

Einsteins famous formula E=mc^2 relates energy E,mass m and the speed of light c. solve the formula for c.

asked by lisa on March 9, 2013
30. ## soofia english medium

A brick has mass 600g and was lifted at the height of 12m with the speed of 9m/s. What energy was used to lift the brick?

asked by maureen on August 9, 2015
31. ## physics

The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. If nonconservative forces, such as kinetic friction and air resistance, are negligible, what would be the height h of the highest point reached by the

asked by Donald on November 11, 2012
32. ## physics

In the (Figure 1) the coefficient of static friction between mass mA and the table is 0.42, whereas the coefficient of kinetic friction is 0.17. Ignore masses of the cord and the (frictionless) pulley. What minimum value of mA will keep the system from

asked by Allie on September 10, 2015
33. ## Physics

The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. If nonconservative forces, such as kinetic friction and air resistance, are negligible, what would be the height h of the highest point reached by the

asked by D on November 12, 2012
34. ## physics

Find the coefficient of kinetic friction between a 4.3-kg block and the horizontal surface on which it rests if an 80 Newton/meter spring must be stretched by 2.7 cm to pull the block with constant speed. Assume the spring pulls in a direction 13 degree

asked by emily on January 19, 2011
35. ## Physics 1

The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. If nonconservative forces, such as kinetic friction and air resistance, are negligible, what would be the height h of the highest point reached by the

asked by Donald on November 17, 2012
36. ## physics

A particle makes a head-on-collision with an unknown particle at rest.The proton rebounds back with 4/9 of its initial kinetic energy.Find the ratio of mass of unknown particle to mass of proton assuming the collision to be elastic.

asked by Nantu on September 2, 2011
37. ## Chemistry

World energy supplies are often measured in the unit of quadrillion British thermal units (10^12 btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81*10^17kJ. Current annual energy consumption in the United States is

asked by M on October 7, 2012
38. ## Chemistry

World energy supplies are often measured in the unit of quadrillion British thermal units (10^12 btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81*10^17kJ. Current annual energy consumption in the United States is

asked by M on October 7, 2012
39. ## Physics

The typical lifetime of a star like our Sun is 10 billion years. While a star like our Sun is able to generate energy in its core (through fusion) the thermal pressure balances the gravitational pressure from the Sun’s mass. However, once the star rules

asked by Vivek on November 23, 2015
40. ## chem

A photon of ultraviolet (UV) light possesses enough energy to mutate a strand of human DNA. What is the energy of a single UV photon having a wavelength of 24 nm? What is the energy of a mole of UV photons having a wavelength of 24 nm?

asked by sarah on January 20, 2008
41. ## Physics

A circular disk of mass 0.3 kg and radius 40 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.1 rad/s. a) Find the new angular velocity of the combination; A circular

asked by John on December 4, 2011
42. ## science

Earth's energy sources include both nonrenewable and renewable resources. Name at least three sources of energy that could be used in your house. The describe the ideal energy source for generating most of your home's electricity, and explain why you chose

asked by Bob on May 5, 2015
43. ## physics

If the average household uses electrical energy daily at the rate of 500. W, how much U-235 must undergo fission to supply this need for a year? (assume 200. MeV of energy are generated per fission and that the power plant is 46% efficient). 1. Energy used

asked by sasha on March 16, 2010
44. ## English

Thank you very much for your corrections! Can you help me checking these other two paragraphs? 1) Last summer at my friend’s house, before a party, his dog was closed in a room where there was a lot of food for the dinner.(Better: the accident occured at

asked by Franco on January 29, 2010
45. ## Calculus

In a 21 meter race between a turtle and a hare, the turtle leaves 8 minutes before the hare. The hare, by running at an average speed of 0.5 meters per hour faster than the turtle, crosses the finish line 4 minutes before the turtle. What are the average

asked by Devin on November 14, 2017
46. ## physics

A 55-kg woman contestant on a reality television show is at rest at the south end of a horizontal 148-kg raft that is floating in crocodile-infested waters. She and the raft are initially at rest. She needs to jump from the raft to a platform that is

asked by Tyler on March 6, 2012
47. ## science

When a tennis ball smashes into a tennis racket, the ball temporarily changes shape as it compresses against the racket. Which type of energy is temporarily stored with the ball as it is compressed? (1 point) elastic potential kinetic electrical potential

asked by Anonymous on May 4, 2015
48. ## chemistry

suppose a car operates so inefficently that only 16% of the thermal energy from burning fuel is converted to useful "wheel turning" (mechanical energy) how many kj of useful energy would be stored in a 20 gallon tank of gasoline?(assume that octane burning

asked by jer on March 31, 2011
49. ## Chemistry

Energy Level Transfer of Hydrogen's electron. For each line, determine the prinicpal energy level to which hydrogen's electron was excited. When the electron fell to the 2nd level, energy was released corresponding to each of the lines. E= 2.179X10-18

asked by Melody on November 7, 2012
50. ## Electric currents and magnetic fields

Within a material, what results in the conversion of an electron's energy to thermal energy and electromagnetical energy? The electron moving makes an magnetic field, if it changes, there will be an electric field with the magnetic field. Thermal energy is

asked by Kalee on December 14, 2006
51. ## physics

A softball (350g) is thrown with an initial speed of 23 m/s straight upward. What is the maximum potential energy the softball can have?

asked by Sandy on December 9, 2009
52. ## Physics

How many joules of energy per kilogram of rest mass are needed to bring a spacecraft from rest to a speed of 0.77c?

asked by Tom on September 14, 2014
53. ## Science

A ball thrown vertically upward has a speed of 5.0 m/s at a height of 3.0m. The mass of the ball is 1.2 kg. Find its mechanical energy

asked by Karl on March 11, 2016
54. ## physical science

a yo-yo is swung in a vertical circle in such a way that its total energy KE+ Pe is constant. At what point in the circle is the speed a maximum? minimum? why?

asked by Brian on November 6, 2011
55. ## Physics

Work is done on an object of mass 2kg to increase its kenetic energy to 18J. Calculate the speed of the object.

asked by Anonymous on February 17, 2013
56. ## Science

Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. Humans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of them. To solve this problem,

asked by ღMs. Marieღ on April 25, 2019
57. ## Chemistry

why does inoinzation energy tend to decrease from top to bottom within a group? i'm not sure, but i think it has something to do with the size of the element The electrons involved in ionization, that is, the outermost electrons, are farther away from the

asked by Mark on October 31, 2006
58. ## Physics

1. A block of mass 57.1 kg rests on a slope having an angle of elevation of 28.3°. If pushing downhill on the block with a force just exceeding 162 N and parallel to the slope is sufficient to cause the block to start moving, find the coefficient of

asked by Cameron on October 3, 2018
59. ## Physics - Scott help!

1. A block of mass 57.1 kg rests on a slope having an angle of elevation of 28.3°. If pushing downhill on the block with a force just exceeding 162 N and parallel to the slope is sufficient to cause the block to start moving, find the coefficient of

asked by Cameron on October 3, 2018
60. ## Physics

A boy pushes his friend across a skating rink. Since the frictional forces are very small, the force exerted by the boy on his friend's back is the only significant forece acting on the friend in the horizontal direction. Is the change in kinetic energy of

asked by Taylor on November 14, 2010
61. ## Physics

a pendulum has a bob of 0.20kg and is suspended by a string of negligible mass near the earth's surface. the pendulum is displaced from its equilibrium position by the angle of 8.0 degrees. it passes the equilibrium position 0.50 s after being released.

asked by secret on May 12, 2010
62. ## Dynamics

The man slides the 100-kg crate across force of 200 N. If the crate was initially at rest, how far will the crate move before its speed is 1 m/s? The coefficient of kinetic friction between the crate and the floor is 0.18. The man is pulling the crate at a

asked by Ivan on March 17, 2014
63. ## Science. (I'm patient, no rush)

Which of the following sets of words can be used to describe the outputs of photosynthesis? A. water, glucose, light energy B. Carbon dioxide, glucose, chemical energy C. oxygen, glucose, chemical energy D. glucose, oxygen, light energy*** Am I correct?

asked by No one special on March 9, 2016
64. ## Combustion

In a combustion reaction, do the products or the reactants store more energy? It is the products right? As heat energy goes into the products. Potential energy is greater in the reactants. Heat is lost in the reaction, so the products have lower energy.

asked by Steve on March 2, 2007
65. ## PHYSICS Collision of two Balls Momentum!! HELP

A ball A of mass .202 kg is moving at a velocity of 2.0 m/s toward a ball B that is at rest. (a) Calculate the initial momentum for Ball A and Ball B. (b) Calculate initial Kinetic energy for Ball A and Ball B. My doubt since its asking for initial moment

asked by Pam on April 11, 2016
66. ## PHYSICS Momentum!! Collision HELP

A ball A of mass .202 kg is moving at a velocity of 2.0 m/s toward a ball B that is at rest. (a) Calculate the initial momentum for Ball A and Ball B. (b) Calculate initial Kinetic energy for Ball A and Ball B. My doubt since its asking for initial moment

asked by Pam on April 12, 2016
67. ## Physics

A 0.55-kg air cart is attached to a spring and allowed to oscillate. If the displacement of the air cart from equilibrium is x=(10.0 cm)cos[(2.00 s ^-1)t + pi], find the maximum kinetic energy of the cart. Find the maximum force exerted on it by the

asked by Cooper on November 17, 2011
68. ## College Algebra

a hardware store owner chooses to enclose an 800 square foot rectangular area in front of her store so that one of the sides of the store will be used as one of the four sides of the fence. if the two sides that come out from the store front cost \$3 per

asked by Brianna on September 18, 2011
69. ## Physics

1. If a mass on a spring and a pendulum have the same period on the moon where the gravity is about 1/6 of its value on the Earth, which one will run faster on the Earth? a. The mass on the spring. b. The pendulum. c. They will both run the same. d. It

asked by Ben on January 9, 2012

Physical Education has been an extremely tough class, but I it has done me some justice. Despite how tough and painful it was, it all payed off in the end. Before this class started, running a mile seemed like the toughest task anyone could ever ask.

asked by Bryce on December 11, 2011
71. ## Physics

If the net work done on an object is positive then the object's energy is ...? The object's energy would also increase since W= energy right? The object's energy wouldn't increase or decrease.

asked by Andrea on October 17, 2007
72. ## physics

Using conservation of energy, find the speed v_b of the block at the bottom of the ramp. Express your answer in terms of some or all the variables m, v, and h and any appropriate constants. I would think it would be square root of v^2+2gh but its telling

asked by Mrs G on March 3, 2012
73. ## physics

Calculate the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck’s constant is 6.626 x 10-34 joule seconds, the speed of light is 2.998 x 108 m/s)

asked by Anonymous on September 30, 2015
74. ## Physics

A girl on a sled with a total mass of 90kg starts from an elevation of 100meters. At the bottom of the run her speed is 30m/s. How much energy in joules was lost due to friction?

asked by Anonymous on July 8, 2014
75. ## Physics

Use the Law of conservation of energy to predict the final speed of a bowling ball dropped from the top of a 25.0 m tall building just before hitting the ground. ignore air resistance.

asked by lexi on November 10, 2016
76. ## physics: waves

A simple pendulum of length 1 m is released when it makes an angle of 6 degrees with the vertical. Find: a) The speed at the lowest point; b)If the mass of the bob is 260 g, what is the total energy? Thank You

asked by Asp on February 3, 2014
77. ## Physics

(i)For the wheel of diameter 10 cm, find its final speed after traversing a distance of 10 m down an incline of 25º. Assume it starts from rest. I know i have to use the conservation of energy but how? i don't understand where to start off

asked by Oisin on August 5, 2010
78. ## science PLZ HELP

electric charges that are different A) attract each other B) repel each other C) exist in pairs D) do not interact Magnetic field lines around a bar magnet A) are only perpendicular to the magnet B) spread out from one pole and curve around the other C)

asked by Anonymous on March 31, 2015
79. ## PHYSICS

A toy gun launches a small plastic sphere using a spring. The spring has a spring constanct of 20 J/M^2 and the plastic sphere has a mass of 25 grams. Before launch x initial is -10cm velocity initial is 0 m/s After launch x final is o cm In order to

asked by GRISSELL on February 28, 2012
80. ## chemistry

Use kinetic molecular theory to explain why approximating ideal behavior (PV=nRT) is fairly accurate only at low pressures and high temperatures. Use several concepts of kinetic molecular theory, not just math, to explain.

asked by Lay on October 13, 2015
81. ## Physics

two air carts of mass m1=0.87kg and m2=0.48kg are placed on a frictionless track.cart 1 is at rest initally, and a spring bumper with a force constant of 690N/m. cart 2 has a flat metal surface for a bumper, and move toward the bumper of the stationary

asked by Has on November 23, 2015
82. ## physics 2

- Matter is made of charged particles - The motion of charged particles produces electromagnetic waves - Since light is an electromagnetic wave, the color of a substance is ultimately related to the way that charged particles in that substance can move

asked by Daniella on August 7, 2014
83. ## physics 2

- Matter is made of charged particles - The motion of charged particles produces electromagnetic waves - Since light is an electromagnetic wave, the color of a substance is ultimately related to the way that charged particles in that substance can move

asked by lost physics 2 student on August 7, 2014
84. ## Physical Science

If potential energy of an electron in ground state is -13.6 eV. The energy of next higher state is: a) -27.2 eV b) -6.8 eV c) -3.4 eV d) none of these please help me. Is it B? If I understand you question, yes, B is the correct answer. The energy of the

asked by Elda on June 13, 2006
85. ## English

I have an test on these and I do not want to fall the test. Please tell me a ways I can study, online tests etc so that I can pass it. Thank you and I appreciate for your help! They are: They will be fill in the blanks, multiply choices. (1)Petroleum (2)

asked by Amanda on April 19, 2012
86. ## physics

Tiger Woods can hit a golf ball quite hard. A golf ball just after being hit by Mr. Woods has a kinetic energy of 100 J and a momentum of 3 kg m/s. What is the mass of the golf ball in grams?

asked by nice on March 5, 2013
87. ## Algebra

The kinetic energy of a particle of mass M is found by taking one-half of the product? I would like to see if a got the correct answer My answer 1/2*mass*velocity*velocity=1/2 ...the product of mass and the square of velocity.

asked by Ivette on June 26, 2007
88. ## physics

Which one of the following statements is true for two bodies having same kinetic energy but different masses? a. they have same velocity b. they have same momentum c. the momentum of smaller mass body is smaller than the other d. the momentum of smaller

asked by Jeremy on June 14, 2012
89. ## physics(check my work)

A 60.0 kg person bends his knees and then jumps straight up. After his feet leave the floor, his motion is unaffected by air resistance and his center of mass rises by a maximum of 14.9 cm. Model the floor as completely solid and motionless. a)With what

asked by phys on April 3, 2010
90. ## Another Commerical

Ive done one on one of the prescription drugs, and I also want to do a complaint against the 5 hour Energy drinks because it isnt really healthy. The healthy choice is to get enough sleep, eat well, and do some exercise such as aerobics. I need to know who

asked by Anonymous on March 2, 2011
91. ## chemistry

The temperature at which a reaction is running is increase from 11.052 celsius to 102.567 celsius. If the rate constant increases by a factor of 5.608, what is the activation energy of the reaction in kJ/mol? Use the Arrhenius equation. I AM STILL LOST The

asked by Rob on February 6, 2007
92. ## Physics

1. A kid was tobogganing but the warm sun melted the snow and he must now pull his 10kg toboggan on the muddy slope (coefficient of kinetic friction is 0.3, the bottom of the hill is 10 degrees). He pulls with a force of 30N. The parallel force applied is

asked by Alex on April 1, 2008
93. ## College Algebra

Kathy and Cheryl are walking and running in a fundraiser. Kathy completes the course in 6 hours and Cheryl completes the course in nine hours. Kathy went on average two miles per hour faster than Cheryl. Find Kathy and Cheryl's speed.

asked by Anonymous on September 2, 2017
94. ## physics

A bird has a mass of 0.2 kg and is flying 10 m above the ground with a speed of 7 m/s. What is the total mechanical energy of the bird? Acceleration due to gravity is g = 9.8 m/s2.

asked by Jesus on June 25, 2014
95. ## ITT

A 1kg object has a potential energy of 20 J while stationary at the top of an incline. Neglecting friction, what is its speed halfway down the incline?

asked by Anonymous on July 8, 2015
96. ## physics

A boy reaches out of a window and tosses a ball straight up with a speed of 15 m/s. The ball is 20 m above the ground as he releases it. Use energy to find the following.

asked by nicole on December 1, 2009
97. ## Physics

A ball is thrown straight up in the air at an initial speed of 30 m/s. Using conservation of energy, find the maximum height of the ball.

asked by Joey on November 20, 2012
98. ## physics

A mass m is thrown horizontally at 5.00 m/s off a 20.0m high cliff. find its speed at impact a)using projectile analysis (20.4m/s) b) using energy analysis

asked by sammeh on November 26, 2009
99. ## science

What do you mean by law of conservation of energy. Use this law to find speed of an object just before hitting the ground if it is allowed to fall through a height of 19.6m.

asked by peehu goyal on February 14, 2016
100. ## Uni Physics

Total mechanical energy of a flying rubber ball is 1692 J. It has a mass of 0.86 kg, and it is 8 m above the ground. Find the speed of the ball.

asked by David Gia on October 2, 2012