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0 votes
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in Physics by (21.8k points)

A person of mass M is, sitting on a swing of length L and swinging with an angular amplitude θ0. If the person stands up when the swing passes through its lowest point, the work done by him, assuming that his center of mass moves by a distance l(l<<L), is close to;

(1)  mgl (1 + θ02)

(2)  mgl

(3)  mgl(1 + θ20/2)

(4)  mgl(1 – θ20

1 Answer

+2 votes
by (59.6k points)
selected by
 
Best answer

Correct option  (1)  mgl (1 + θ02)

Explanation:

The force acting on the man at the lowest point

F = mg + mv2max/L

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