Question

What is the change in kinetic energy of the body if its mass and velocity are doubled ?
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Answer 1

Answer:

Kinetic energy of a body of given mass, is directly proportiional to its square of its velocity. When momentum is doubled, mass remaining constant, this means velcity is doubled. Hence, kinetic energy becomes 22=4 times i.e. say from 100 units to 400 units.

Answer 2

Answer:

As we know

K.E.=1/2mv^2

I.e. the kinetic energy is directly proportional to the mass and square of the body if mass and velocity both are doubled then the K.E. is multiplied by the factor of 6

I.e. the new k.e.=6×K.E.

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