Question

A man takes 20 seconds to climb 5m up a ladder. He weighs 720N. Calculate the power he must deliver to do this.

Answer 1

Power = 180 Watt.

Step-by-step explanation:

W = Work done = m x g x H.

m = mass of the body.

g = acceleration due to gravity = 9.8 m/s^2.

W = weight of the body = m x g = 720 N.

H = height of the body = 5 m.

t = Time = 20 s.

Plugging the above values in the formula we get:

W = 720 x 5 = 3600 J.

Power =
`(W)/(t)`

=
`(3600)/(20)` = 180 Watt.

Therefore the required value of power = 180 Watt.