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A machine has a power of 20 kW. How long will it take for it to lift a body of mass 10 kg from the ground to a height of 100 m? (Assume g = 10m/s2) |
6 seconds. 5 seconds. 2 seconds. 2.5 seconds. |
2 seconds. |
Power = Energy x Time (P) = (E) x (t) 20000 = (m x g x h) x t = (10 x 10 x 100) x t \(\Rightarrow\) t = 2 seconds. |
