A small particle rest on the top of a hemisphere of radius 20 cm .The smallest horizontal velocity os given to it , if it is to leave the hemisphere w
A small particle rest on the top of a hemisphere of radius 20 cm .The smallest horizontal velocity os given to it , if it is to leave the hemisphere without sliding down to 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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Correct Answer - B
`v=sqrt(rg)`
`=sqrt(0.2xx9.8)=sqrt(196xx10^(-2))=14xx10^(-2)`
`=1.4 m//s`
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