In the figure, the disc $D$ does not slip on the surface $S$ , the pulley $P$ has mass and the string does not slip on it. The string is wound around the disc.

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The sum of the kinetic energies of $D$ and $B$ is less than the loss in the potential energy of $B$ as it moves down

The acceleration of the block $B$ is double the acceleration of the centre of $D$

The horizontal and the vertical sections of the string has the same tension

The force of friction exerted by $D$ on $S$ acts to the left

answer is A, B, D.

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Detailed Solution

According to the given figure $V_{B} = 2 V_{d i s c}$ ………..(1)

After taking derivatative $a_{B} = 2 a_{d i s c}$ here $b$ & $d$ are conceptual

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