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The free end of a simple pendulum is attached to the ceiling of a box. The box is taken to a height and the pendulum is oscillated. When the bob is at its lowest point, the box is released to fall freely. As seen from the box during this period, the bob will

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stop

will go in a circular path

move on a straight line

continue its oscillation as before

answer is C.

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Detailed Solution

As seen from the freely falling box(which is a non-inertial frame of reference), net force on the pendulum bob = mg-mg = 0. Therefore, after the box is released, the bob will continue to move in a vertical circular path with constant speed.

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