A) they are equal in mass
B) they are losing kinetic energy
C) they are made of different materials
D) they do not have any stored energy
Correct Answer: C
Solution :
The kinetic energy of an object depends on its mass and speed. The cars are moving at the same speed; therefore their masses must be different. Since they are of the same size, it is likely that they are made of different materials, which makes their masses different.
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