Question

What happens to the kinetic energy when:

(i) The mass of the body is doubled at constant velocity?

(ii) The velocity of the body is doubled at constant mass?

(iii) The mass of the body is doubled but the velocity is reduced to half?​

Answer 1

Answer:

a) KE is directly proportional to mass so when mass is doubled KE is also doubled.

b) KE is directly proportional to the squareof velocity so when velocity is doubled KE becomes 4 times.

c) mass is doubled and velocity is halved.

So KE' = 2×1/4 KE

THAT IS KE will be halved.

The formula is KE =1/2 × m × v^2

Hope it helps..

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Answer 2

1 is wrong 2 nd is right 4 is right