Question

A student with a mass of 75 kg runs up a 4 meter flight of stairs in 3.9 s. What is the power exerted by the student? *

Answer 1

753.9Watts

Step-by-step explanation:

Given parameters:

Mass of the student = 75kg

Height = 4m

Time = 4.9s

Unknown:

Power exerted by the student = ?

Solution:

To solve this problem, we must know that power is the rate at which work is done.

Power =
`(work done)/(time)`

Work done = mgh

m is the mass

g is the acceleration due to gravity

h is the height

Power =
`(75 x 9.8 x 4)/(3.9)` = 753.9Watts