A train is moving with constant velocity v along a straight portion of the track

Question

A train is moving with constant velocity valong a straight portion of the track. A boy sitting in the trainfacing forward carefully places a ball on the floor, just in frontof his seat. Which choice is correct A)The ball rolls under the seat, because no forces are actingon it pushing it forward. B)The ball rolls forward, away from the boy, because no forcesare acting on it, and it will keep its forward motion. C)The ball stays where the boy has placed it because offriction. D)The ball stays where the boy has placed it, because noforces are acting on it, and therefore it keeps on moving withconstant velocity. E)The ball stays where the boy has placed it, because it isbeing pulled along by the train. A train is moving with constant velocity valong a straight portion of the track. A boy sitting in the trainfacing forward carefully places a ball on the floor, just in frontof his seat. Which choice is correct A)The ball rolls under the seat, because no forces are actingon it pushing it forward. B)The ball rolls forward, away from the boy, because no forcesare acting on it, and it will keep its forward motion. C)The ball stays where the boy has placed it because offriction. D)The ball stays where the boy has placed it, because noforces are acting on it, and therefore it keeps on moving withconstant velocity. E)The ball stays where the boy has placed it, because it isbeing pulled along by the train.

Explanation / Answer

According to first law we have net force on the ball is zero. Sothat choice 'D' is correct. Ans: D)The ball stays where the boyhas placed it, because no forces are acting on it, and therefore itkeeps on moving with constant velocity.

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