“50 km going north" is an example of Please explain why you have chosen this quantitative category with brief, but clear, detail.
Is your answer a scalar or vector quantity?

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. 

Ur mom because that makes a lot of sense