Average power output of machine

[Mar17]

Homework Statement

what is the average power output of an engine lifts a 250kg mass a distance of 30.0m in 20.0s?

Homework Equations

Ek= (1/2)(m)(v^2)
Ep=mgh
Ew=fnet x distance
Es= (1/2)kx^2

The Attempt at a Solution

Ep+Ek=f x d
(.5)(200)(3)^2 + (200)(9.81)(5)= fx5.00

900+9810/5.00=f
f=2142N

 

[pgardn]

Homework Statement

what is the average power output of an engine lifts a 250kg mass a distance of 30.0m in 20.0s?

Homework Equations

Ek= (1/2)(m)(v^2)
Ep=mgh
Ew=fnet x distance
Es= (1/2)kx^2

The Attempt at a Solution

Ep+Ek=f x d
(.5)(200)(3)^2 + (200)(9.81)(5)= fx5.00

900+9810/5.00=f
f=2142N

Power is a certain amount of work done over a certain period of time.

 

[EngineerHead]

Use the relevant equation of P = Fv

So you simply have to solve for F and v.