In an experiment to measure his power, a student records the time taken by him in running in 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 = 9.8 m s-2
Due to gravity
Number of steps = 28
Height of each step = 20 cm
Total height of student = 28 * 20 = 560 cm
= 5.6 m
Time, t = 5.4 sec
Mass of student, m = 55kg
Acceleration due to gravity, g = 9.8 m/s2
Power = 
= 
= 
= 559W (approx)
49