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 5m, the number of balls thrown per minute will be
A
40
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B
50
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C
60
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D
120
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Solution
The correct option is C60 As we know that, Hmax=u22g ⇒u=√2gHmax=√2×10×5 ⇒u=10m/s Now, time to reach Hmax by each ball is t=ug=1010=1sec Thus, balls thrown in 1min will be 60.