A man having a wrist watch and a pendulum clock rises on a $TV$ tower. The wrist watch and pendulum clock per chance fall from the top of the tower. Then
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(d) Function of wrist watch depends upon spring action so it is not effected by gravity but pendulum clock has time period, $T = 2\pi \sqrt {\frac{l}{g}} $. During free fall effective acceleration becomes zero, so time period comes out to be infinity i.e. the clock stops.
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