SAQ : What change of kinetic energy of a body will be observed when (i) its mass is doubled, (ii) its velocity is doubled? 

Question

What change of kinetic energy of a body will be observed when (i) its mass is doubled, (ii) its velocity is doubled? 

Answer

1. When the mass of a body is doubled, the kinetic energy doubles if the velocity remains constant.
2. When the velocity of a body is doubled, the kinetic energy increases by a factor of four if the mass remains constant.