Question

A cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of g/4. Then the work done by the cord on the block is –

• A. Mgd/4
• B. 3 Mgd/4
• C. Mgd
• D. – 3Mgd/4

Answer 1

Answer: (D)

– 3Mgd/4

Answer 2

W = Fd con q = (4) (cos 180⁰)