10. A girl pushes her little brother on his sled with a force of 300 N for 750. m. How much
work is this if the force of friction acting on the sled is
(a) 200 N,
(b) 300 N?
(a). W = F x D
W = (300 - 200) x 750
W = 100 x 750
W = 75000J
(b). W = F x D
W = (300 - 300) x 750
W = 0 x 750
W = 0. It the sled doesn't move
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