Posted by **Jim** on Monday, December 5, 2011 at 10:00am.

A 90 kg mover climbs a ladder to a height of 8 m in 32 s. Find the power rating of the mover. I solved by using P= mgh/t and came up with 220.5 watts. Is this correct or am I suppose to use P=w/t and not use gravity in the equation?

- Physics -
**Damon**, Monday, December 5, 2011 at 10:03am
P= mgh/t

is correct.

Potential energy gained is m g h Joules.

Power is energy per unit time, Joules per second or Watts.

- Physics -
**bobpursley**, Monday, December 5, 2011 at 10:04am
work= change in potential energy= mgh

You did use it.

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