JEE Main Physics question
A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 sec is (J = 4.2 joule/cal and g = 9.8 m/s²)
Answer: (A)
Solution
Friction force = μmg = 0.2×2×9.8 = 3.92 N. Distance travelled in 5 s = 2×5 = 10 m.
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