A three part question.

How much work is done when you push a crate horizontally with 80N across a 9.0-m factory floor?

I got W=720J

Second part

If the force of friction on the crate is a steady 70 N, find the KE gained by the crate.

I have no clue how to start this

And third

Find the energy turned into heat.

I just need some help with the last two please

Question

A three part question. 

How much work is done when you push a crate horizontally with 80N across a 9.0-m factory floor? 

I got W=720J 

Second part 

If the force of friction on the crate is a steady 70 N, find the KE gained by the crate. 

I have no clue how to start this

And third

Find the energy turned into heat.

I just need some help with the last two please

jt950 · Answer

Assume no energy lose in this process,

Ek=(80N-70N)x9m
    =90J

Heat energy = 720J-90J
                   =630J

anonymous · Answer

work is force times the distance