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A girl in a swing is 2.5m above ground a...

A girl in a swing is 2.5m above ground at the maximum height and at 1.5m above the ground at the lowest point. Her maximum velocity in the swing is `(g = 10ms^(-2))`

A

`5sqrt2 ms^(-1)`

B

`2sqrt5 ms^(-1)`

C

`2sqrt3 ms^(-1)`

D

`3sqrt2 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`mg (h_1-h_2)=1/2mv^2`
`implies v= sqrt(20(2.5 -1.5))implies v=2sqrt5 m//s`
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