Question

Example 11.8 A boy of mass 50 kg runs
up a staircase of 45 steps in 9 s. If the
height of each step is 15 cm, find his
power. Take g = 10 m s-2​

Answer 1

Answer:

distance travelled = 45 * 15

= 675 cm = 6.75 m

power = energy/time

= mgh / time

= 50 * 10 * 6.75 / 9

= 675 * 5 / 9

= 75*5