You and your friend, both of mass 70 kg, are playing catch with a frisbee on frictionless ice. Initially, you are both at rest. You throw a 0.175 kg frisbee at 10 m/s horizontally at your friend, who catches it.

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physics

You and your friend, both of mass 70 kg, are playing catch with a frisbee on frictionless ice. Initially, you are both at rest. You throw a 0.175 kg frisbee at 10 m/s horizontally at your friend, who catches it. After they catch the frisbee, what is the relative velocity ...

physics

You and your friend, both of mass 70 kg, are playing catch with a frisbee on frictionless ice. Initially, you are both at rest. You throw a 0.175 kg frisbee at 10 m/s horizontally at your friend, who catches it. After they catch the frisbee, what is the relative velocity ...

physics

A dog with a mass of 15kg jumps forward at 0.50m/s to catch a frisbee coming in the opposite direction at 5m/s. the dog catches the frisbee in its mouth and in doing so its velocity drops to 0.45m/s. What was the mass of the frisbee?

MATH

vIRGINIA THREW A fRISBEE FOR A DISTANCE OF 138.56 M TO CAPTURE THE WOMEN'S RECORD. IF THE FRISBEE WAS THROWN HORIZONTALLY WITH A SPEED OF 13.0M/S HOW LON DID THE FRISBEE REMAIN ALOFT?

physics

virginia threw a frisbee for a distance of 138.56m to capture the womans recrod. If the frisbee was thrown horizontally with a speed of 13.0 m/s, how long did the frisbee remain aloft?

physics

Compute the linear momentum and angular momentum of a Frisbee of mass 0.175 kg if it has a linear speed of 1.65 m/s and an angular velocity of 61.5 rad/s. Treat the Frisbee as a uniform disk of radius 12.0 cm.

Physics

An astronaut with mass M floating at rest in the International Space Station catches a spinning frisbee that someone has thrown directly towards his or her center of mass. The frisbee has a mass m, a radius r, a moment of inertia of ⅔ mr2, and had a speed vo and was ...

Physics

A Frisbee is thrown horizontally with a speed of 12 m/s. If the Frisbee moves a horizontal distance of 15 m, how long will it stay in the air?

Physics

A frisbee is thrown horizontally with a speed of 12 m/s. If the frisbee moves a horizontal distance of 15 m, how long will it stay in the air?

physics

Why can a Frisbee (or an aerobie) be thrown so much further than a ball? Comment on the applicability of above for throwing a Frisbee or an aerobie on the Moon

math

(1)How much water can be held by a cylindrical tank with a radius of 12 feet and a height of 30 feet. (2)The diameter of a frisbee is 12 inches, what is the area of the frisbee

trig

A frisbee is thrown within an angular velocity of 360 rpm. If the diameter of the frisbee is 12 inches, how fast does it travel when it hits the ground rolling on the side? round your answer to the nearest mph

physics

One side of the roof of a building slopes up at 35.5°. A student throws a Frisbee onto the roof. It strikes with a speed of 15.0 m/s and does not bounce, but slides straight up the incline. The coefficient of kinetic friction between the plastic and the roof is 0.450. The ...

Physics

Compute the linear momentum and angular momentum of a Frisbee of mass 0.160 kg if it has a linear speed of 2.00 m/s and an angular velocity of 50.0 rad/s. Treat the Frisbee as a uniform disk of radius 15.0 cm.

Physics

Compute the linear momentum and angular momentum of a Frisbee of mass 0.141 kg if it has a linear speed of 2.35 m/s and an angular velocity of 55.0 rad/s. Treat the Frisbee as a uniform disk of radius 15.5 cm.

algebra

sally's print shop will print any image on a frisbee for a cost of $1.50 per frisbee and a one-time charge of $7. write an algebraic equation using c for cost and f for frisbees.

Physics

A Frisbee gets stuck in the top of a tree, 60 meters above the ground. What is the smallest initial velocity you could throw a ball to reach the Frisbee and dislodge it? A. 48.5 m/s from an angle of 45 degrees above the horizontal B.48.5 m/s from directly underneath the ball C...

Physics

Mass 1 with a unknown mass starts at rest at the top of a frictionless from a height of 13 meters. It then slides down the incline and moves over a horizontal frictionless surface and collides inelastically (head on) with mass 2 which is 25.4 kg and initially at rest. After ...

Economics

Here is a question that my professor posted... "Assume the price elasticity of demand for U.S. Frisbee. frisbees is -0.6. If the company increases the price of each frisbee from $6 to $8, the number of frisbees sold will:" The answer is: Decrease by 17.1 percent What I would ...

physics

A 98.0 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 49.5 m/s. If both are initially at rest and if the ice is frictionless, how far does the player recoil in the time it takes the puck to reach the goal 13.5 m away?

Physics

Ann, a 66.2 kg person throws a 0.0461 kg snowball forward with a ground speed of 39.2 m/s. Billy, with a mass of 54.8 kg, catches the snowball. Both people are on skates (Disregard friction between the skates and the ice. ). Ann is initially moving forward with a speed of 2.02...

Physics

An object with a mass of 20.1 kg is hung from two identical springs vertical. The springs both stretch 0.23 meters from equilibrium with the attached mass. One of the those springs is placed on a horizontal surface without friction and the mass of 20.1 kg is held still next to...

Physics

Mass 1 with a mass of 28.5 kg starts at rest at the top of a frictionless from a height of 17 meters. It then slides down the incline and moves over a horizontal frictionless surface and collides inelastically (head on) with mass 2 which is of unknown mass. After the collision...

Physics

A team in Quebec is playing ice baseball. A 72 kg player who is initially at rest catches a 145 g ball traveling at 18 m/s. If the player's skates are frictionless, how much time is required for him to glide 5 m after catching the ball?

math

find the circumference of a frisbee that has a diameter of 4 inches?

Physics

A 0.9-kg block (mass m) and a second block (mass M) are both initially at rest on a frictionless inclined plane. Mass M rests against a spring that has a force constant of 12.2 kN/m. The distance d along the plane between the two blocks is 3.64 m. The 0.9-kg block is released...

Physics - Angular Momentum

A 230 kg beam 2.4 m in length slides broadside down the ice with a speed of 22 m/s. A 65 kg man at rest grabs one end as it goes past and hangs on as both he and the beam go spinning down the ice. Assume frictionless motion. a) How fast does the center of mass of the system ...

physics

As shown in the figure, a block of mass M1 = 0.470 kg is initially at rest on a slab of mass M2 = 0.850 kg, and the slab is initially at rest on a level table. A string of negligible mass is connected to the slab, runs over a frictionless pulley on the edge of the table, and ...

physics

Bob, who has a mass of 75 kg, can throw a 500 g rock with a speed of 30 m/s. The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. a. What constant force must Bob exert on the rock to throw it with this speed? b. ...

physics 100

Bob, who has a mass of 60 , can throw a 800 rock with a speed of 26 . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 . a) What constant force must Bob exert on the rock to throw it with this speed? b)If Bob is...

Physics

A cart of mass M1 = 6 kg is attached to a block of mass M2 = 3 kg by a string that passes over a frictionless pulley. The system is initially at rest and the table is frictionless. After the block has fallen a distance h = 1 m: What is the work Ws done on the cart by the ...

physics

Bob, who has a mass of 80kg , can throw a 550g rock with a speed of 27m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. What constant force must Bob exert on the rock to throw it with this speed? If Bob ...

Physis

The question: You are standing on a large sheet of frictionless ice and holding a large rock. In order to get off the ice, you throw the rock so it has velocity 11.9 m/s relative to the earth at an angle of 36.8∘ above the horizontal. If your mass is 70.5 kg and the rock...

physics

Jennifer (mass 58.0 kg) is standing at the left end of a 13.0 m long 594.0 kg cart that has frictionless wheels and rolls on a frictionless track. Initially both Jennifer and the cart are at rest. Suddenly, Jennifer starts running along the cart at a speed of 5.70 m/s relative...

Physics

A hanging mass, M1 = 0.78 kg, is attached by a light string that runs over a frictionless pulley to a mass M2 = 1.48 kg that is initially at rest on a frictionless table. Find the magnitude of the acceleration, a, of M2 in m/s^2.

physics

A 96.5 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 45.5 m/s. If both are initially at rest and if the ice is friction less, how far does the player recoil in the time it takes the puck to reach the goal 18.0 m away?

physic:(

Two ice skaters, Daniel (mass 70.0 ) and Rebecca (mass 45.0 ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 14.0 before she collides with him. After the collision, Rebecca has a velocity of magnitude 8.00 at an ...

Physics

an ice skater with a mass of 80kg pushes off against a second skater with a mass of 32kg. both skaters are initially at rest. a. what is the total momentum of the system after the push off? b. if the larger skater moves off with a speed of 3m/s, what is the corresponding speed...

Physics please help

A man standing on a frictionless ice throws a boomerang which returns to him. Asuuming that the boomerang can only move in a a circular path, choose the correct statement: A)Since the momentum of the man-boomerang system is conserved, the man will ocme to rest holding the ...

Physics (please help!!!!)

A man standing on a frictionless ice throws a boomerang which returns to him. Asuuming that the boomerang can only move in a a circular path, choose the correct statement: A)Since the momentum of the man-boomerang system is conserved, the man will ocme to rest holding the ...

Physics

Cart A, of mass 3.00 kg, approaches and collides with cart B, which has a mass of 7.00 kg and is initially at rest. When the springs have reached their maximum compression, a. cart A has come to rest relative to the ground. b. both carts have the same velocity. c. both carts ...

Physics

Cart A, of mass 3.00 kg, approaches and collides with cart B, which has a mass of 7.00 kg and is initially at rest. When the springs have reached their maximum compression, a. cart A has come to rest relative to the ground. b. both carts have the same velocity. c. both carts ...

PHYSICS 1 ..'''''''''''''''''''''''' helllpppppppp

A girl of mass (Mg) is standing on a plank of mass (Mp). Both are originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity (vgp) to the right relative to the plank. (The subscript gp ...

Physics

A block of ice at 0 degrees C, whose mass is initially 40.0 kg, slides along a horizontal surface, starting at a speed of 5.26 m/s and finally coming to rest after traveling 22.5 m. Compute the mass of ice melted (in grams) as a result of friction between the ice and the ...

Physics

A box of mass m2 = 3.1 kg rests on a frictionless horizontal shelf and is attached by strings to boxes of masses m1 = 1.6 kg and m3 = 2.6 kg as shown below. Both pulleys are frictionless and massless. The system is released from rest. After it is released, find the tension in ...

physics projectile - please help....

You are in an egg drop contest which you win by breaking your egg the hardest. You drop your egg off of a 3 story building (above the ground). You can throw it up with speed 11m/s, or straight down with speed 11 m/s. Ignoring air resistance, which case will make it hit the ...

physics

A 68.0 kg person throws a 0.0450 kg snowball forward with a ground speed of 27.0 m/s. A second person, with a mass of 58.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.50 m/s, and the second person is ...

physics

A 69.0 kg person throws a 0.0410 kg snowball forward with a ground speed of 35.0 m/s. A second person, with a mass of 60.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.00 m/s, and the second person is ...

physics

A 69.0 kg person throws a 0.0410 kg snowball forward with a ground speed of 35.0 m/s. A second person, with a mass of 60.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.00 m/s, and the second person is ...

physics

A 66.0-kg person throws a 0.0450-kg snowball forward with a ground speed of 35.0 m/s. A second person, with a mass of 57.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.40 m/s, and the second person is ...

physics

A(n) 86.6 kg person throws a(n) 0.06 kg snow- ball forward with a ground speed of 42.3 m/s. A second person, of mass 41.5 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.06 m/s, and the second person is ...

Physics

Ann, a 66.1 kg person throws a 0.0460 kg snowball forward with a ground speed of 31.7 m/s. Billy, with a mass of 60.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.29 m/s, and Billy is initially at rest. After the ...

Physics URGENT!!!

Ann, a 66.1 kg person throws a 0.0460 kg snowball forward with a ground speed of 31.7 m/s. Billy, with a mass of 60.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.29 m/s, and Billy is initially at rest. After the ...

Physics URGENT!!!

Ann, a 66.1 kg person throws a 0.0460 kg snowball forward with a ground speed of 31.7 m/s. Billy, with a mass of 60.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.29 m/s, and Billy is initially at rest. After the ...

Physics URGENT!!!

Ann, a 66.1 kg person throws a 0.0460 kg snowball forward with a ground speed of 31.7 m/s. Billy, with a mass of 60.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.29 m/s, and Billy is initially at rest. After the ...

Physics

A 4-kilogram mass has a speed of 6 m/s on a horizontal frictionless surface. The mass collides head-on and elastically with an identical 4-kilogram mass initially at rest. The second 4-kilogram mass then collides head-on and sticks to a third 4-kilogram mass initially at rest...

science help plzzzzzzzzzzzzzzz?

A planet orbiting a star is occasionally hit by comets. Each comet has a mass of 4.8 × 10^6 kg of which 30% is rock and 70% is water ice. Each time a comet hits the planet 40% of the mass of the comet is vaporised and the rest is added to the planet, increasing the mass of ...

physics

In the frictionless apparatus m1=1.7kg a)What is m2 if both masses are at rest? b) How about if both masses are moving at constant velocity?

physic

Two boxes are connected by by a massless string over a massless, frictionless pulley. Box 1 has a mass of m1 = 15.0 kg and is initially at rest at the bottom of a frictionless surface inclined at an angle θ = 30.0◦ above the horizontal. Box 2 has a mass of m2 = 10.0...

physic

Two boxes are connected by by a massless string over a massless, frictionless pulley. Box 1 has a mass of m1 = 15.0 kg and is initially at rest at the bottom of a frictionless surface inclined at an angle θ = 30.0◦ above the horizontal. Box 2 has a mass of m2 = 10.0...

Physics

Please help I've attempted this problem various ways and I can't seem to get the correct answer. A 69.0 kg person throws a 0.0410 kg snowball forward with a ground speed of 35.0 m/s. A second person, with a mass of 60.0 kg, catches the snowball. Both people are on skates. The ...

Physics

Please help I've attempted this problem various ways and I can't seem to get the correct answer. A 69.0 kg person throws a 0.0410 kg snowball forward with a ground speed of 35.0 m/s. A second person, with a mass of 60.0 kg, catches the snowball. Both people are on skates. The ...

science

Two objects slide over a frictionless horizontal surface. The object A with a mass of 5000g is moves at a speed of 4.5m/s toward the object B (mB= 2500g) which is initially at rest. After the collision, both objects are directed to 30O on either side of the original line of ...

physics

In the Figure the pulley has negligible mass, and both it and the inclined plane are frictionless. Block A has a mass of 1.3 kg, block B has a mass of 2.7 kg, and angle è is 26 °. If the blocks are released from rest with the connecting cord taut, what is their total kinetic...

Physics

It’s a beautiful winter day, and you and your friend are throwing around a 5 kg medicine ball on a very slippery frozen lake. You throw the ball toward your friend, and notice that you subsequently slide backwards with a speed of 1 m/s. If your mass is 60 kg, how fast did ...

physics

Stuck in the middle of a frozen pond with only your physics book, you decide to put physics in action and throw the 6-kg book. If your mass is 54 kg and you throw the book at 14 m/s, how fast do you then slide across the ice? (Assume the absence of friction. Let the direction ...

Physics

Stuck in the middle of a frozen pond with only your physics book, you decide to put physics in action and throw the 9-kg book. If your mass is 45 kg and you throw the book at 10 m/s, how fast do you then slide across the ice? (Assume the absence of friction. Let the direction ...

Physics

Gayle runs at a speed of 3.80 m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. ...

Physics URGENT!!!

Gayle runs at a speed of 9.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 20.0 m. After she has descended a vertical distance of 4.00 m, her brother, who is initially at rest, hops on her back, and ...

Physics URGENT!!!

Gayle runs at a speed of 9.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 20.0 m. After she has descended a vertical distance of 4.00 m, her brother, who is initially at rest, hops on her back, and ...

physics

Gayle runs at a speed of 3.80 m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. ...

physics

gayle runs at a speed of 4.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill. after she has descended a vertical distance at a 5.00 m, her brother,who is initially at rest, hops on her back, and they continue down the hill together, ...

science

A man of mass 50kg is walking on a long wooden board of mass 200 kg. The wooden board is initially at rest on a frictionless ice surface. If the man walks with a velocity 1m/s in the positive x direction relative to the wooden board,find the velocity of the board in m/s?

physics

A block of ice at 0°C whose mass initially is m = 48.4 kg slides along a horizontal surface, starting at a speed vo = 4.91 m/s and finally coming to rest after traveling a distance d = 12.28 m. Compute the mass of ice melted as a result of the friction between the block and ...

science(Ms.Sue)

Both owls and hawks live in the same ecosystem.they both hunt and kill mice, voles and rabbits.how can both types of predators find enough food in the same ecosystem? a)they are active in different areas. b)they are active at different times. c)they cooperate to only catch ...

physics

Ian is firmly attached to a snowboard which is on a flat surface of ice, which you can assume to be frictionless. He and the snowboard are initially at rest. He then throws a 138 g ball which travels at a speed of 19.2 m/s, and finds himself moving backwards at a speed of 0.05...

Physics 1

A 50 kg cannonball hits a war tank vehicle of 12,000 kg that is initially at rest. The cannonball embeds in the tank and both move at the same velocity for 50 cm until they both come to a rest. What is the initial velocity of the cannonball if the coefficient of friction ...

physics

You and your friend are on the roof of a 20 m tall building investigating a free fall. Your friend releases a small rock from rest. You throw another rock simultaneously with your friend aiming it straight down. (a) What initial speed should you supply to the rock so it hits ...

physics

Gayle runs at a speed of 8.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 14.0 m. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back, and ...

HELP!!!

A light, inextensible cord passes over a light, frictionless pulley with a radius of 10 cm. It has a(n) 24 kg mass on the left and a(n) 6.1 kg mass on the right, both hanging freely. Initially their center of masses are a vertical distance 4.3 m apart. The acceleration of ...

Physics

1. The problem statement, all variables and given/known data A 2.0-m measuring stick of mass 0.175 kg is resting on a table. A mass of 0.500 kg is attached to the stick at a distance of 74.0 cm from the center. Both the stick and the table surface are frictionless. The stick ...

Physics

A trapeze artist weighs 8.00 x 10^2 N. The artist momentarily held to one side of a swing by a partner so that both of the swing ropes are at an angle of 30º with the vertical. In such a condition of static equilibrium, what is the horizontal force being applied by the ...

Lingusitics

Hello everyone!! For these six sentences, I have to explain what determines whether the sentence is grammatical or not 1) Both the students were studying. 2) The students were both studying. 3) They were both studying. 4) *Both they were studying. 5) Both of you were studying...

physics

A uniform 2.00-m-long stick is raised at an angle of 30° to the horizontal above a sheet of ice. The bottom end of the stick rests on the ice. The stick is released from rest. The bottom end of the stick remains in contact with the ice at all times. How far will the bottom ...

English 10

Whenever I see a competitive game of Ultimate Frisbee, I AM INSPIRED TO JOIN A TEAM. Which type of clause is bolded? adjective clause adverb clause noun clause independent clause

10 lit

Whenever I see a competitive game of Ultimate Frisbee, I am inspired to join a team. Which type of clause is underlined? adjective clause adverb clause noun clause independent clause

Kinetic energy

steel ball of mass 0.310 kg is fastened to a cord that is 86.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal, as shown in the figure. At the bottom of its path, the ball strikes a 3.10 kg steel block initially at rest on a frictionless...

Algebra 1, Physics

Muriel and Connie are playing a game of catch. They decided it would be fun to stand on different sides of the building and throw the ball back and forth. Muriel can throw the ball with a velocity of 14 m/s, and Connie can throw with a velocity of 16 m/s. Each stands 10 m from...

Physics

Two chunks of ice are sliding on a frictionless frozen pond. Chunk A, with mass mA=5.0kg, moves with initial velocity vA1=2.0m/s parallel to the x-axis. It collides with chunk B, which has a mass mB=3.0kg and is initially at rest. After the collision, the velocity of chunk A ...

physics

Two chunks of ice are sliding on a frictionless frozen pond. Chunk A, with mass mA=5.0kg, moves with initial velocity vA1=2.0m/s parallel to the x-axis. It collides with chunk B, which has a mass mB=3.0kg and is initially at rest. After the collision, the velocity of chunk A ...

physics

A block of ice at 0°C whose mass initially is m = 12.5 kg slides along a horizontal surface, starting at a speed vo = 4.10 m/s and finally coming to rest after traveling a distance d = 10.07 m. Compute the mass of ice melted as a result of the friction between the block and ...

math

You and your friend each have a coin. For each round, each of you flips your coin. If both coins show heads, your friend pays you $3. If both show tails, your friend pays you $1. If the coins don't match, you pay him $2. Is this a fair game?

physics

Unless otherwise stated, all objects are located near the Earth's surface, where = 9.8 . A hockey puck with a weight of 0.80 is sliding freely across a section of very smooth (frictionless) horizontal ice. Part A When it is sliding freely, how does the upward force of the ice ...

physics

In,the,ideal,apparatus,m1=2.0kg,What,is,m2,if,both,mass,are,at,rest?,How,about,if,both,masses,are,moving,at,constant,velocity?,angle,is,37,deg,and,ther,is,gravity

Physics

Outside the International Sapce Station, a 60 kg astronaut holding a 4.0 kg object (both initially at rest) throws the object at 10 m/s relative to the space station. A 50 kg astronaut, initially at rest, catches the object. What is the speed of the separation of the two ...

science

A bullet having a mass of 10g and moving with a speed of 1.5m/s penetrates a thick wooden plank of mass 90g. The plank was initially at rest. The bullet gets embedded in the plank and both moves together. Determine their velocity

Help History

How were the Revolutionary efforts of George Mason and Thomas Jefferson most alike? Both worked together to write the Declaration of Independence. Both initially refused to serve in the Constitutional Convention. Both served on the committee to negotiate peace with Britain ...

PHYSICS

An arrangement of 3 blocks A ,B,C such that block A of mass 5 kg is over block B of 6 kg, with a friction between them of 0.8. both the blocks are connected to the 3rd block C of mass m by a string and frictionless pulley. Now to find at what value of m will both pulley A and ...

physics

You and a friend stand on a snow-covered roof. You both throw snowballs from an elevation of 18 m with the same initial speed of 11 m/s, but in different directions. You through your snowball downward, at 40° below the horizontal; your friend throws her snowball upward, at 40...

Physics

You are travelling in your car at 50km/hr, your friend is traveling at 25 km/hr, both have the same mass. What distance do you need to travel to stop compared to the distance that your friend needs to stop? How will the stopping distance change if you and your friend are ...

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