Question

what is the change in the kinetic energy of a body if its velocity is doubled and the mass is halved?

Answer 1

as it be ke =1/2mv²so acc to condition so substitute m by m/2 and v by 2v so we get
=1\2*m/2*(2v)²= m/4*4v²=mv² so we get twice of original kE and new ke=2kE