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Balls are thrown vertically upwards in s...

Balls are thrown vertically upwards in such a way that the next ball is thorwn when the previous one is at the maximum height. If the maximum hieght is `5m`, the number of balls thrown per minute will be

A

`40`

B

`50`

C

`60`

D

`120`

Text Solution

Verified by Experts

The correct Answer is:
C
`v = sqrt(2gh) rArr v = sqrt(2xx 10xx5) rArr v = 10m//s`
time taken by ball to attain max height
`v = u +at rArr 0 - u - gt rArr t = 1 sec`.
so each ball in one second or `60` balls per min.
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