Question

Car moving with velocity of 15m/s what is the kinetic energy of boy sitting in the car of mass 40kg

Answer 1

Answer:

k.e. = 1/2 * mv²

   v = 15 m/s

   v = 18 km/h

k.e. = 1/2 * 40 * 18²

      = 20 * 324

      = 6480             [answer]

Answer 2

Answer:

Kinetic energy = 1/2*mv² = 1/2*40*15² = 20*225 = 4500J