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A heavy body slides without friction down a triangular prism as shown in Fig.. The prism lies on a horizontal plane and can move over it without friction. In the first case, the prism is held stationary, in the second, it is free to move. Will the velocity of the body be the same in both cases when it reaches the bottom, if it starts out from the same height?

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In the second case the velocity of the body will be smaller, since the store of potential energy possessed by the body at the height h is converted, in the first case, entirely into the kinetic energy of the body and, in the second case, into the kinetic energy of the body and the prism, simultaneously. 

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