Question

A boy of mass 50kg runs up a staircase of 48steps in 16 seconds if the height of each of steps is15cm find his power g=10m/s^2

Answer 1

Answer:

225 Watts

Explanation:

m = 50kg, t = 16s, a = 10m/s², s = (48×15)cm = 720cm = 7.2m

Work done = Force × Displacement

W = m × a × s = 50×10×7.2 = 3600 J

Now, Power = Work Done/time taken

P = W/t = 3600/16 = 225 Watt

Answer 2

Given mass of body (m)=50kg

h=48×15=720cm=7.2m

t=16s    δ=10m

Potential energy =mgh

                             =(50×10×7.2)5

                             =18,000

Power of the body =Time × Potential energy

                                =18,000÷ 16

                                =1,125 W