A pump on the ground floor of a building can pump up water to fill a tank of volume `30 m^3` in 15 min. If the tank is 60 m above the ground, and the efficiency of the pump is 40%, how much electric power is consumed by the pump?
(Take `g = 10 m s^(-2)`)

A motor can pump up water to fill a tank of volume 500 m^3 in 25 minutes, which is placed at a height of 20m. If efficiency of the motor is 40% , calculate the power of the motor.

A water pump raises water at a rate of 0.50 m^3// min from a depth of 30 m . If the pump is 70% efficient . What power is developed by the engine . g=9.8 m*s^(-2) and density of water = 10^3 kg *m^(-3) .

A pump can raise 100 L of water per minute to a height of 10 m . What should be the power of the pump ?

A ball is thrown vertically upwards with a velocity of 20 ms^(-1) from the top of a multistorey building. The height of the point from where the ball is thrown is 25.0 m from the ground. (a) How high will the ball rise ? and (b) how long will it be before the ball hits the ground ? Take g = 10 ms^(-2) .

How much water per minute a pump of power 2 kW can reise to a height of 10 m ? (g=10 m//s^(2))