Question

A body of mass 10 kg is moving with the velocity
20ms-1
. If the mass of the body is doubled and its
velocity is halved, find: (i) the initial kinetic energy,
and (ii) the final kinetic.

Answer 1

Answer:

(i) 2000J

(ii) 1000J

Explanation:

Kinetic Energy=1/2×m×v^2

Initially,

m=10kg

v=20m/s

=>Initial Kinetic energy=1/2×10×20×20=2,000J

Final,

m=10×2=20kg

v=20/2=10m/s

=>Final Kinetic energy=1/2×20×10×10=1,000J

Hope it helps...

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