800 kW power is supplied to a motor of 70% efficiency. This motor is in turn connected to a crane,whose efficiency is also 70%. If this crane lifts a 20 ton rock, its velocity is

800 kW power is supplied to a motor of 70% efficiency. This motor is i

1.	800 kW power is supplied to a motor of 70% efficiency. This motor is in turn connected to a crane,whose efficiency is also 70%. If this crane lifts a 20 ton rock, its velocity is
Answer» `2MS^(-1)` `0.2ms^(-1)` `20MS^(-1)` `10MS^(-1)` ANSWER :A