Question

a boy of mass 40kg runs up a height of 60 step each 10cm high in 5 sec find the power developed by the boy.

Answer 1

Given Data:

Mass of a boy = m = 40 kg

No. of steps = 60

Height of each step = h = 10 cm = 0.1 m

Total height = 60 x 0.1 = 6 m

Time = t = 5 sec

Work done = W = ?

Power = P = ?

Solution:

Work done = W = m g h
W = (40) (10) (6)    (∵g = 10 m/s²)
W =  2400 J

Now,
Power = P = Work done/Time taken
P = W/t = 2400/5
P = 480 W

480 watt is the required answer.

Answer 2

Answer:

Write 60 on 50