Question

From a dam, water is pouring down at the rate of 150kg/s, on the blades of a turbine. If a ball is dropped from the same dam takes 2root5 sec to hit the turbine, then the power delivered to the turbine is approximately equal to(take g =10m/s)

Answer 1

$h = 0.5 \times g \times {t}^{2} \\ = 0.5 \times 10 \times ( {2 \sqrt{5} })^{2} \\ = 100m \\ p = 150 \times 10 \times 100 \\ = 150000kw$