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2015-04-15T20:59:54+05:30

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Weight of the crane + weight of the load = 500 + 300 = 800 kg
gravitational force due to the weight = 800 * g =  800 * 10  Newtons.

     Resistance to lifting action of the crane  like friction etc. = 1,200 N
  Total force needed to lift the load with a velocity 0.2 m/s = 8,000 + 1,200 Newtons

power needed to lift the load with a velocity (uniform)
     P = F * v  =  9, 200 N * 0.2 m/sec =  1, 840 Watts

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