Chemistry math help

Question

A1555kg 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?

Answer 1

Kinetic Energy (KE) = 1/2 mv²

m = mass in kg = 1555 kg

v = velocity in meters per second = 90.6 km/hr x 1000 m/km x 1 hr/3600 sec = 25.17 m/sec

KE = 1/2 (1555 kg)(25.17 m/sec)²

KE = 1/2 (985,137 kg m²/sec²

KE = 492,569 kgm²s^-2 = 492,569 J = 493 kJ