A ball is moving to and fro about the lo...

A ball is moving to and fro about the lowest point A of a smooth hemispherical bowl. If it is able to rise up to a height of 20 cm on either side of A , its speed at A must be (Take `= 10m//s`, mass of the body 5 g )

A

`0.2 m//s`

B

`2 m//s`

C

`4 m//s`

D

`4.5 ms`

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The correct Answer is:

B

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