Question

A car of 2000 kg lifted up a distance 30m by a crane in 2min what is the power supplied by a crane

Answer 1

Mass, m = 2000kg

Distance, d = 30 m

Time, t = 1 min 

           = 60 sec

second crane does the same job in 2 min = 120 sec

Work done = Force x displacement

Force = m x g

so, Work done = m x g x h

                        = 2000 x 10 x 30

                        = 600000 J

Power = work done / time

           = 600000/60

           = 10000 watt

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