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A child is swinging a swing. He is one m...

A child is swinging a swing. He is one metre above the ground at the lower point and 2 metre above the gound at the highest point. The speed of the child at the lowest point of the swing is : `(g = 10 ms^(-2))`

A

`4.5 ms^(-1)`

B

`6.4 ms^(-1)`

C

`7.8 ms^(-1)`

D

`10 ms^(-1)`

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The correct Answer is:
a
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