A man whose mass is 50 kg moves up 15 steps each of height 15 cm in 45 seconds of time. Calculate the power used in climbing those stairs. (g = 10 m/s2)
Given
Mass of Body (m) = 50 Kg,
Time (t) = 45s,
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 = 25 Watt
Power used in climbing stairs = 25 W