A 1445 kg car is traveling down the road at 90.6 km/h. While traveling at this rate of speed, what is the kinetic energy of this vehicle in kilojoules?

Question

It also requests that E_k = answer = kJ. How would I convert that?

Answer 1

KE = 1/2 mv2

m = mass in kg = 1445 kg

v = velocity in m/s = 90.6 km/hr x 1000 m/km x 1 hr/3600 s = 25.16 m/s

KE = 0.5 x 1445 kg x 633 m²/s²

KE = 457,343 kgm2/s2 = 457,343 J

To convert to kJ divide by 1000 = 457.3 kJ