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NEET 2015 Physics question

PhysicsWork, Energy and PowerNEET 2015

A block of mass 10 kg, moving in direction with a constant speed of , is subjected to a retarding force during its travel from to . Its final KE will be :

Answer: (4)

Solution

Initial kinetic energy . Work done by the retarding force: \int_{20}^{30}\dfrac{x^2}{2}$ = -0.1× = -25\

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Question ID VK-091819