Question

1. In pulley work is :
(A) Positive
(C) Zero
(B) Negative
(D) Negligible​

Answer 1

Answer:

correct answer

Explanation:

option A is the correct answer is

Answer 2

The answer is : (C) Zero

Tension at both the ends of the thread are equal but they act relatively opposite to each other.

Displacements of both the ends of the thread along the thread are equal.

Therefore work done ( F. ds ) at one end is negative of the work done at the other end. In other words work done (by the tension) at one end is positive and the same at the other end is negative but magnitude-wise both are same. Hence total work done by tension of an ideal thread/ rope is always zero. The statement applies to all the physical systems involving ideal string(s).

Hope this helps you !!