This question came up in a physics paper: there are two tracks A and B, with the direction of gravity specified. If two balls begin to move at the same uniform velocity at the same time, which of the two reaches the end of the track faster?
A site(Physics UMD) says that the ball on B will advance and move further. But what's puzzling is that as the ball travels along the lowered platform, shouldn't it lose some velocity, so that it wouldn't be able to regain its original velocity ?
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