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A 40kg child sits on a swing supported b...

A 40kg child sits on a swing supported by two chains,each 3 m long. If the tension in each chain at lowest point in 350 N, then the child's speed at the lowest point is [Take g=10`m//s^2`]

A

4.7`m//s`

B

3`m//s`

C

7.2`m//s`

D

9.1`m//s`

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The correct Answer is:
A
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