Question

An impulse "I" given to a body changes its velocity from "v1 to v2" . The increase in the kinetic energy of the body is given by

Answer 1

I = impulse given to a body of mass m 
  = change in the momentum of the body 
  = mv2 - mv1

Increase in kinetic energy of the body 
  ΔKE = 1/2 mv2² - 1/2 mv1² 
          = 1/2 m (v2+v1) (v2-v1)
          = I * (v2+v1)

Answer 2

Answer:

I/2(v2+v1)

Explanation:

Change in kinetic energy =1/2mv2square-1/2mv1square                                                         m/2(v2square-v1square)    (change in momentum is impulse)                                  m/2(v2-v1)(v2+v1)  =I/2(v2+v1)