question_answer 35)

  A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the potential energy of the car (a) does not change (b) becomes twice to that of initial (c) becomes 4 times that of initial                             d) becomes 16 times that of initial

Answer:

  (a) Potential energy of the car don't change and kinetic energy changes by as follows Let, initial velocity = u  Kinetic energy Given, after sometime velocity become 4 times of its initial velocity i.e., final velocity (v) = 4u Now, put v = 4u, in Eq. (i), we get  Kinetic energy                                                                                                                      ?.1                                                                                                            From Eq. (i),                    So in this process, the kinetic energy of car becomes 16 times that of initial energy.