Question

what is the effect on Momentum and kinetic energy of the body on doubling its velocity​

Answer 1

here is your answer Momentum is directly proportional to velocity. If the momentum of an object is doubled, but its mass does not increase (so velocity remains well below the speed of light), then its velocity is doubled. If the velocity is doubled then the kinetic energy increases by the square of 2, or four time.

Answer 2

on doubling the velocity momentum will be doubled

P= mv= m(2v)= 2 mv

and Energy will be 4 times

E = mv^2= m(2v)^2 = 4 mv^2