Calculating Energy Transfer and Work Done by a Crane

[Lolagoeslala]

Homework Statement

A creane lifts a 1500 kg car straight 20 m [up]
How much potential energy does the car gain?
How much energy does the crane transfer to the car?
How much work does the crane do?

The Attempt at a Solution

How much potential energy does the car gain?
Eg = mgh
Eg = (1500 kg)(9.8m/s^2)(20m)
Eg = 294000 J

How much energy does the crane transfer to the car?
Eg = - 294000 J

How much work does the crane do?
I am not sure

 

[haruspex]

How much energy does the crane transfer to the car?
Eg = - 294000 J

If A were to transfer a negative amount of energy to B, would that not be the same as taking energy from B?

How much work does the crane do?
I am not sure

In the absence of any data concerning losses due to friction etc., what do you think the answer is?