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

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

A

475 J

B

450 J

C

275 J

D

250 J

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