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55. An army vehicle of mass 1000 kg is moving with a velocity of 10 m/s and is acted upon bya forward force of 1000 N due to the engine and a retarding force of 500 N due to friction.What will be its velocity after 10 s(A) 5 m/s(B) 10 m/s(C) 15 m/s(D) 20 m/s

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