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A stone is whirled in a vertical circle ...

A stone is whirled in a vertical circle at the end of a rope of length 0.5m . The velocities of the stone at lowest and highest points to just complete the circle are `[Take ,g =9.8ms^(-2)]`

A

`4.949and 2.213ms^(-1)`

B

`5.921and 3.312ms^(-1)`

C

`1.235and 2.312ms^(-1)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
Given , radius , r=0.5m and g =9.8`ms^(-2)`
Velocity at lowest points , `v_L=sqrt5rg=sqrt5xx0.5xx9.8 =4.949ms^(-1)`
Velocity at highest points ,`v_L=sqrt5rg=sqrt5xx0.5xx9.8 =4.949ms^(-1)`
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