Crane A lifts a weight to a height of 20 m in 20 sec and crane B takes 10 sec for the same. If the work done and power required by crane A is W A &W A and crane B is W B &W B respectively. Which of the following statement is true?
O W A <W B \& dot W A ne dot W B
O W A <W B \& dot W A = dot W B
O W A =W B \& dot W A ne dot W B
O W A <W B \& dot W A = dot W B
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Answer: Given : m=600kg h=20 m
Time of operation t=2 min =120 s
Work done in lifting a box W=mgh=600×10×20=120000
Power required P= W/t=120/120000=1000 watts
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