A guy is standing in a lift falling freely under gravity releases a ball from hand. As seen by the ball, the boy:
Correct answer: B. Remains stationary
- A. Falls down
- B. Remains stationary
- C. Goes up
- D. None of above
Explanation
The acceleration of the body does not depend upon the mass of the freely falling body. Hence both man and ball have the same acceleration. Hence their velocities at every point would be the same. So relative velocity is zero. Hence the ball will always remain stationary as seen by him.
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
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About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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