For an experiment to measure his power, a student records the time taken by him in running up a flight of steps on a staircase. Use the following data to calculate the power of the student.
Number of steps = 28 Height of each step = 20 cm Time taken = 5.4 s Mass of student = 55 kg Acceleration due to gravity = 9.8 ${{ms}^{-2}}$
Given, n = 28, h = 20 cm 0.2 m, t = 5.4 s m = 55 kg, g = 9.8 ${{ms}^{-2}}$
We know that the power of student is given by
P = n x W/t = n x mgh/t
= 28 x 55 x 9.8 x 0.2 / 5.4 = 559 W