An object of mass m moving in a certain direction has a kinetic energy of 4.0 J. It hits a wall and comes back with half its original kinetic energy. If the speed of the object on return is 2.0 m/s, what is the mass of the object?
A. 2.8 kg
B. 3.8 kg
C. 1.0 kg
D. 4.0 kg
Answer:C
An object of mass m moving in a certain direction has a kinetic energy of 4.0 J. It hits a wall and comes back with half its original kinetic energy. If the speed of the object on return is 2.0 m/s, what is the mass of the object?
A. 2.8 kg B. 3.8 kg C. 1.0 kg D. 4.0 kg