A block of mass 10 kg is moving in x-direction with a constant speed of 10 m/sec. It is subjected to a retarding force F = –0.1 x joule/metre during its travel from x = 20 metre to x = 30 metre. Its final kinetic energy will be

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Q: A block of mass 10 kg is moving in x-direction with a constant speed of 10 m/sec. It is subjected to a retarding force F = –0.1 x joule/metre during its travel from x = 20 metre to x = 30 metre. Its final kinetic energy will be

(a) 475 joule

(b) 450 joule

(c) 275 joule

(d) 250 joule

Ans: (a)

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