In the given diagram calculate the work done by the normal force exerted on each block by the bigger block in 1s

Question

TestHub · Accepted Answer

C (3 kg) outweighs A (1 kg), so C descends and B slides right over the block; momentum conservation drives the 5 kg block leftward.

In the block's frame the pseudo force presses A into the left wall: the wall's normal on A is nonzero and A moves with the block, so $W_{A} \neq = 0$

The same pseudo force pushes C away from the right wall, so C loses contact: $N_{C} = 0 \Rightarrow W_{C} = 0$

B's normal is vertical while its displacement is horizontal: $W_{B} = 0$

Ans. (C)

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