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

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
`(1)/(2)m v^(2)=mg(h_(2)-h_(1))`
`v=sqrt(2g(2-0.75))=sqrt(2xx10xx1.25)=5" ms"^(-1)`
Correct choice is ( c ).
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