A body of weight mg is hanging on a string which extends its length l. The workdone in extending the string is ……….. .
A. mgl
B. \(\frac { mgl }{ 2 }\)
C. 2 mgl
D. none of these
Answer:B
A body of weight mg is hanging on a string which extends its length l. The workdone in extending the string is ……….. .
A. mgl B. \(\frac { mgl }{ 2 }\) C. 2 mgl D. none of these