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Questions  

A simple pendulum bob has a mass “m” and  length “L”. The bob is drawn aside such that  the string is horizontal and then it is released. The velocity of the bob while it crosses the equilibrium position is

a
gL
b
2gL
c
5gL
d
3gL

detailed solution

Correct option is B

M V22=MgL V =2gL

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Two similar springs P and Q have spring constants Kp and KQ such that Kp > KQ. They are stretched first by the same amount (case a), then by the same force (case b). The work done by the springs WP and WQ are related as, in case (a) and case (b), respectively.


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