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Question

# The length of simple pendulum is 1m and mass of its bob is 50 gram. The bob is given sufficient velocity so that the bob describes vertical circle whose radius equal to length of pendulum. The maximum difference in the kinetic energy of bob during one revolution is:

A
0.98 J
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B
1.96 J
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C
4.9 J
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D
9.8 J
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Solution

## The correct option is A 0.98 JL=1m,m=0.05kgVb=√5gR m/sVt=√gRthe velocity is maximum at bottomthe velocity is minimum at top∴ΔKE=12m[(√5gR)2−(√gR)2]=m2[4gR]=2×(0.05)(9.8)(1)=0.98 J

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