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Question

A ball is thrown vertically downward with a velocity u from the top of a tower. It strikes the ground with a velocity 3u. The time taken by the ball to reach the ground is given by
  1. ug
  2. 2ug
  3. 3ug
  4. 4ug


Solution

The correct option is B 2ug
Using first equation of motion, we have
v=u+at,
As v=3u and a=g, we have
3u=u+gt2u=gtt=2ug

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