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Physics-

General

Easy

Question

A disc of mass 2 M and radius R is placed on a fixed plank (rough) of length L. The coefficient of friction between the plank and disc is $mu$ = 0.5. String (light) is connected to centre of disc and passing over a smooth light pulley and connected to a block of mass M as shown in the figure. Now the disc is given an angular velocity $omega subscript 0 end subscript$ in clockwise direction and is gently placed on the plank. Consider this instant as t=0. Based on above information, answer the following questions : Mark the correct statement w.r.t. motion of block and disc.

The block remains at rest for some time, t > 0
The block starts accelerating just after placing of disc on plank
The disc is performing pure rotational motion for some time t > 0
Both (A) and (C) are correct.

The correct answer is: Both (A) and (C) are correct.

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