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Question: Answered & Verified by Expert
A mass M is lowered with the help of a string by a distance h at a constant acceleration g2. The work done by the string will be
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Options:
  • A Mgh2
  • B -Mgh2
  • C 3Mgh2
  • D -3Mgh2
Solution:
1126 Upvotes Verified Answer
The correct answer is: -Mgh2
Tension in the string

T=Mg-a=Mg-g2=Mg2

W= Force × displacement

=-Mgh2

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