question_answer

  (a) Define kinetic energy of an object. Can kinetic energy of an object be negative? Give reason. (b) A car weighing 1200 kg is uniformly accelerated from rest and covers a distance of 40 m in 5 s. Calculate the work, the car engine had to do during this time.

Answer:

           (a)The energy possessed by a body by virtue of its motion is called its kinetic energy. No, the kinetic energy of an object cannot be negative because both m and are always positive and (b)Given, or