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A simple pendulum is suspended from the ...

A simple pendulum is suspended from the ceiling of an empty box falling near earth surface. The total mass of the system is M. The box experience air resistance `vec R=-kvec V`,where v is the velocity of the box and k is positive constant. After some time it is found that the period of oscillation of pendulum becomes double the value when it would have suspended from a point on earth. The velocity of box at that moment (take g in air same as on earth's surface)

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