12) Two cars of different masses are on top of a hill. They start to move, at th

Question

12) Two cars of different masses are on top of a hill. They start to move, at the same time, down the hill under the influence of gravity until they reach ground. After they reach the ground level, which one of the following sentences is correct? Ignore friction A) The speed of the heavier car will be larger than the speed of lighter car B) The speed of the lighter car will be larger than the speed of heavier car. C) The lighter car will reach the ground first. D) The heavier car will reach the ground first E) None of the above

Explanation / Answer

None of the above.

From law of conservation of energy we can say that whatever is the potential energy at the top same amount of kinetic energy will be at the bottom so from here both will have equal speed 2gh at the bottom.

So we can say time of travel will also be equal.

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