Question


A ball of mass 1 kg is suspended by an inextensible string 1 m long attached to a point O of a smooth horizontal bar resting on fixed smooth supports A and B. The ball is released from rest from the mass of the bar is 4 kg. The displacement of bar when ball reaches the other extreme position (in m) is

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A

0.4

B

0.2

C

0.25

D

0.5

Hard
Solution
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Correct option is B)

Here,
Energy stored in pendulum = work done on block

Displacement,


Relative displacement,

Thus,


m

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