A) 20cm, 30cm, 60cm
B) 60cm, 30cm, 20cm
C) 60cm, 20cm, 30cm
D) 30cm, 60cm, 20cm
Correct Answer: B
Solution :
\[\operatorname{Efficiency} \eta =\frac{{{E}_{o}}}{{{E}_{1}}}\] \[\frac{28}{100}=\frac{mgh}{21\times 1000}\] \[2\times 21\times 10=40\times 10\times h\] \[\operatorname{h}=14.7=15m\]You need to login to perform this action.
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