An engine develops 20 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m ? g = 10 m s - 2

Step-by-step solution

In physics, power is the amount of energy transferred or converted per unit time. Power, P = m × g × h t ⇒ t = m × g × h P ⇒ t = 200 × 10 × 40 20000 ⇒ t = 80000 20000 ⇒ t = 4   s