height => 10 * 6 => 60m
mass => 4000kg and let g = 10m/s^2
therefore , force => mg => 4000*10=> 400000N
so work done => force * displacement
=> 40000*60 => 2400000J
time taken => 10 sec
therefore power => 2400000/10 => 240000W
therefore horse power => 240000/746
=> 321.7 J
