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A block of mass m is placed in contact w...

A block of mass m is placed in contact with one end of a smooth tube of mass M. A horizontal force F acts on the tube in each case (i) and (ii). Then,

A

After time ` t= sqrt((2MI)/F)` , block m will fall down .

B

The relative acceleration between block and plank is zero.

C

The acceleration of block m is zero w.r.t ground before falling on ground

D

The contact force between plank and block will be zero

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The correct Answer is:
A, C
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