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A block of mass 10kg moving in x directi...

A block of mass 10kg moving in x direction with a constant speed of `10 ms^(-1)` , is subjected to a retarding force `F=0.1xJ//m` during its travel from x=20 m to 30 m . Its final KE will be:

A

450 J

B

275J

C

250J

D

475J

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