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A metre stick of mass 400 g is pivoted a...

A metre stick of mass 400 g is pivoted at one end and displaced through an angle `60^(@)` . The increase in its potential energy is

A

2J

B

3J

C

0J

D

1J

Text Solution

Verified by Experts

The correct Answer is:
D
`PE= mgh= "mg" (l)/(2) (1- cos theta)`
`= 0.4 xx 10 xx (1)/(2) (1- cos 60^(@))= 1J`
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