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Question

If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is
  1. 2gt2
  2. 12gt2
  3. gt2
  4. 32gt2


Solution

The correct option is B 12gt2
If ball is thrown with velocity u, then time of flight =ug

Velocity after (ugt)secv=ug(ugt)=gt

So, distance in last t sec v2=u22gh02=(gt)22ghh=12gt2

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