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A small particle rests on the top of a h...

A small particle rests on the top of a hemisphere of radius 20 cm. The smallest horizontal velocity given to it, if it is to leave the hemisphere without sliding down along its surface, is

A

0.7 `m//s`

B

1.4 `m//s`

C

2.8 `m//s`

D

5.6 `m//s`

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