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 m/s

Verified by Experts

The correct Answer is:

B

From energy conservation-
`v = sqrt(3gR), a = v^(2)/R = 3g`

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