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A particle is kept at rest at the top of...

A particle is kept at rest at the top of a sphere of diameter 84m. When disturbed slightly ,it slides down .At what height h from the botton , the particle will leaves the sphere

A

75m

B

65m

C

70m

D

80m

Text Solution

Verified by Experts

The correct Answer is:
C
As we know for hemisphere the particle will leave the shapere at height h=2r//3`h=(2)/(3)xx42=25m`
`"but from bottom" H =4+r=28 +42=70m`
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