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Rectilinear Motion

Question

In quick succession, a large number of balls are thrown up vertically in such a way that the next ball is thrown up when the previous ball is at the maximum height. If the maximum height is 5 m, then find the number of the balls thrown up per second (g =10 ms-2).

Moderate
Solution

v2=u22gs 0=u2(2)(10)(5) will give u=10 ms1

Further, v=ugt

      0=10(10)t gives t=1s 

Hence only one ball can be thrown in 1 second.



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