Question

If the kinetic energy of a body is increased by 400 percent what would be its percentage increase in momentum

Answer 1

If the KE(initial) = 0.5*m*v^2

KE(final) =4*0.5*m*v^2 = 0.5*m*(2v)^2 ( assuming mass is constant)

So effectively the velocity has doubled, the momentum has doubled.