# mechanics

what is the kinetic energy of an object that has a mass of 20nkilograms and a speed of 2.8 m/s

1. 👍 0
2. 👎 0
3. 👁 38
1. Ke = 0.5mv^2 = 0.5 * 20 * (2.8)^2 = 78.4 Joules.

1. 👍 0
2. 👎 0
posted by Henry

## Similar Questions

1. ### Physical Science

Can someone please check these answers for me? Write T for True or F for False for each statement: 1.Kinetic energy is the energy of motion - T 2.Kinetic energy doesn't depend on an object's direction. - T 3.When an object stops

asked by mysterychicken on April 20, 2009
2. ### science

Two identical masses are moving down a slope. One mass is traveling twice as fast as the other mass. How does the kinetic energy of one mass compare to the other? a. The faster object has the same kinetic energy as the slower

asked by Anonymous on May 4, 2015
3. ### science

Two identical masses are moving down a slope. One mass is traveling twice as fast as the other mass. How does the kinetic energy of one mass compare to the other? a. The faster object has the same kinetic energy as the slower

asked by shynice on February 4, 2016

An object A has half the mass and twice the velocity of object B. How are the kinetic energies of A and B related? A. The kinetic energy of B is 4 times that of A. B. The kinetic energy of B is twice that of A. C. The kinetic

asked by Morgan on November 17, 2014
5. ### Physical Science-Can someone check my answers?

1) The kinetic energy of an object depends on which of the following? A. the object’s mass and direction B. the object’s speed and mass---------- C. the object’s work and direction D. the object’s speed and work 2) In the

asked by dark1 on February 18, 2014
6. ### Physics

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. The work done on object A is 500J. After the force pulled each object, object A moves twice as

asked by Tim on December 9, 2012
7. ### Physics

Object A has mass mA = 9 kg and initial momentum A,i = < 19, -7, 0 > kg · m/s, just before it strikes object B, which has mass mB = 12 kg. Just before the collision object B has initial momentum B,i = < 5, 6, 0 > kg · m/s.

asked by What does this even mean!? on November 21, 2010
8. ### science

1. How much potential energy does a 5kg block have if it is 2m above the ground? 2. What is the mass of an object that has 40J of potential energy and is 10m above the ground? 3. What is the weight of an 8kg object? 4. How much

asked by Dave on October 22, 2011
9. ### chemistry

An electron is accelerated through an electric potential to a kinetic energy of 18.2 keV. What is its characteristic wavelength? (Hint: Recall that the kinetic energy of a moving object is E = 1/2 mv2 where m is the mass of the

asked by marcene on September 23, 2012
10. ### Astronomy

We can calculate the kinetic energy of any moving object with a very simple formula: kinetic energy = 1/2 mv^2 ,where m is the object's mass and v is its velocity or speed. Table Energy Comparisons shows that metabolizing a candy

asked by Isabelle on October 19, 2010

More Similar Questions