A rope exerts a force
on a 20.0-kg crate.The crate starts from rest and accelerates upward at 5.00 m/s2 near the surface of the earth. 
-How much work was done by the force
in raising the crate 4.0 m above the floor?
A) 399 J
B) 250 J
C) 116 J
D) 704 J
E) 1180 J
Correct Answer:
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