Multiple choice

If a boy sitting iii a railway train, moving at constant velocity, throws a ball straight up into the air,

  1. the ball will fall in front of him.

  2. the ball will fall behind hands.

  3. the ball will fall into his hand.

  4. the ball will not return downwards.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a boy throws a ball straight up in a train moving at a constant velocity, the ball retains the horizontal velocity of the train due to inertia. Relative to the boy, the ball only has vertical motion, so it will fall back into his hand. If the train were accelerating or decelerating, the ball would fall in front of or behind him.

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