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) 2.0 kg
B) 2.8 kg
C) 3.8 kg
D) 1.0 kg
E) 4.0 kg

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The Answer of 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) 2.0 kg
B) 2.8 kg
C) 3.8 kg
D) 1.0 kg
E) 4.0 kg

An Object of Mass M Moving in a Certain Direction