A forklift applies a force of 2,000 N to raise a box 3m. 1. If the box weighs 1,500 N, how much work does the force of gravity do on the box?

2. Is the work done by gravity positive or negative?

3. What is the total work done on the box?

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Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared. 

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