A crane lifts an I-beam up the side of a building. The crane's power output is 1750W for 20 seconds. After 20 seconds the I-beam was moving at 2 m/s and the mass has 200 kg. Use the work-energy process to determine the change in height of the I-beam.

Explanation:

This is one of those great problems that is harder to read than to solve!

Remember the following...

Power is the amount of work done over time.

and that work is Force times distance.

and that Force is just mass times acceleration.

So... nesting all the equations together we might get something that looks like.

We know the power, the time, the acceleration (at this given time) and the mass. We can then solve for d.

Plug and chug!

what was the answer?

where are the vectors ?