A car is moving on a levelled road and gets its velocity doubled. In this process,
(i) how would the potential energy of the car changer
(ii) how would the kinetic energy of the car change?
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Answer:i) The potential energy of the car remains same, since PE (= mgh) is independent of velocity.
(ii) The kinetic energy of the car becomes four times, since KE(=1/2 m*v^2) is proportional to square of velocity.
(iii) The momentum of the car will also get doubled, since momentum (p = mv) is proportional to velocity.
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