A boy of mass 50 kg runs up a staircase of 45 steps in 9s. If the height of each step is 15 cm, find his power. (Take g = 10 ms-2)
Given
Mass of Body (m) = 50 Kg,
Time (t) = 9s,
Height of each step = 15 cm,
Acceleration due to gravity (g) = 10 m/s2.
Now
Weight = mg = 50×10 = 500N
Height of staircase =
(∵ 1 m = 100 cm)
Power =
⇒ Power =
Power = 375 Watt