A cupboard is delivered at home. The cupboard weighs 72kg. If the step is 20cm in height, how much work would be required to lift the cupboard onto the step? If two men lift cupboard together on to the step in 1.2s, calculate power developed by each man.
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ANSWER:
Workdone=force*displacement
force=mg
=72kg*9.8m/s
=705.6N
displacement=20cm
=0.2m
workdone=705.6*0.2
=141.12J
power=workdone/time taken
=141.12/1.2
117.6J/s
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