A very large number of balls are thrown vertically upwards in quick succession in such a way tha...

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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 \( 5 \mathrm{~m} \), the number of ball thrown per minute is (take \( g=10 \mathrm{~ms}^{-2} \) )
[KCET 2002]
(a) 120
(b) 80
(c) 60
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