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Question

Balls are thrown vertically upward in such a way that the next ball is thrown when the previous one is at the maximum height. If the maximum height is 5 m, the number of balls thrown per minute will be
  1. 50
  2. 60
  3. 120
  4. 40


Solution

The correct option is B 60
As we know that,
Hmax=u22g
 u=2gHmax=2×10×5
 u=10 m/s
Now, time to reach Hmax by each ball is
t=ug=1010=1 sec
Thus, balls thrown in 1 min will be 60

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