Question

a body of mass m starts from rest and attains a velocity of 'v' m/s in some time 't' seconds. show that kinetic energy of the body is directly proportional to the square of its velocity.​

Answer 1

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Given that: mass=100g=0.1kg; K.E=20J To find: Velocity=? Solution: We know , K.E=1/2mv^2 20=1/2×0.1×v^2 v^2=20×2÷0.1 v^2=40÷0.1 v^2=400 (v=√400) Therefore v=20 m/s.

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