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Question

# A very large number of balls are thrown vertically upwards in quick succession 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 is (take g= 10 ms2)

A
30
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B
60
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C
90
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D
45
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Solution

## The correct option is B 60Maximum height of ball = 5 m So, velocity of projection ⇒u=√2gh=√2×10×5=10 ms time interval between two balls (time of ascent) =ug=1 sec=160 min. So no. of balls thrown per min = 60

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