Question

It takes 5s for the macho man to get a 60kg box (starting from rest) up to a speed of 5m/s.

How many watts of power did he produce?

Answer 1

150W

Step-by-step explanation:

Given parameters:

Time taken = 5s

Mass of box = 60kg

Speed = 5m/s

Unknown:

Power produced = ?

Solution:

To solve this problem, we must understand what power is.

Power is the rate at which work is done.

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

Work done = force x distance = kinetic energy =
`(1)/(2) m v^(2)`

=
`(1)/(2)` x 60 x 5²

= 750J

Therefore power:

Power =
`(750)/(5)`

= 150W