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A simple pendulum is released from A as ...

A simple pendulum is released from A as shown. If m and 1 represent the mass of the bob and length of the pendulum, the gain kinetic energy at B is

A

`(mgl)/2 `

B

`(mgl)/sqrt2 `

C

`sqrt3/2 mgl`

D

`2/sqrt3 mgl`

Text Solution

Verified by Experts

The correct Answer is:
C
`h= l cos 30^@ = (lsqrt3)/2`
`DeltaKE = mgh = (mglsqrt3)/2`
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