A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 20 J in 1s.
Text Solution
Verified by ExpertsThe correct answer is:
B
F = T, WF + WG = 20
WT = 20 ⇒ 20 + WG = 20 ⇒ WG = 0
which is not possible.
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