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A block of mass m is resting inside a sm...

A block of mass `m` is resting inside a smooth horizontal tube. If the tube accelerates vertically downward with acceleration `a=kt` where `k` is a positive constant, the correct plot showing the variation of normal reaction received by the block as a function of time (considering that upward direction of normal reaction is positive and taken towards positive direction `y` axis) will be

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The correct Answer is:
A, C
Upto time `t=g//k, N` will be along upwards direction after that it will be along downward direction.
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