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A child is sitting on a swing.Its minimu...

A child is sitting on a swing.Its minimum and maximum heights from the ground are 0.75 m and 2m respectively. Its maximum speed will be :

A

10 m/s

B

8 m/s

C

5 m/s

D

15 m/s

Text Solution

Verified by Experts

The correct Answer is:
C
Here effective height `h=2-0.75=1.25` m.
Now `(1)/(2)mv^(2)="mgh"impliesv=sqrt(2gh)`
`=sqrt(2xx10xx1.25)=5` m/s.
`:.` correct choice is ( c )
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