Question: A cord is used to lower vertically a block of mass 𝑀 by a distance 𝑑 with constant downward acceleration 𝑔 4 . Work done by the cord on the block is
(A) Mg\dfrac{d}{4}
(B) 3Mg\dfrac{d}{4}
(C) -3Mg\dfrac{d}{4}
(D) 𝑀𝑔d
Answer: Option (B)
Solution:
