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A child pulls a sled of mass $m$ up a hill that makes angle $\theta$ with the horizontal. How much work is done on the sled by gravity after the sled travels distance $L$ along the hill?

A

$m g L$

B

$-m g L$

C

$m g L\space sin\theta$

D

$-mgL\space sin\theta$

E

$mgL\space cos\theta$

F

$-mgL\space cos\theta$

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