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A bolck of mass 10 kg is moving in x-dir...

A bolck of mass `10 kg` is moving in x-direction with a constant speed of `10 m//s`. it is subjected to a retardeng force `F=-0.1 x J//m`. During its travel from `x =20m` to `x =30 m`. Its final kinetic energy will be .

A

`450 J`

B

`275 J`

C

`250 J`

D

`475 J`

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