# Car has a mass of 1525 kg. What is its kinetic energy if it has a speed of 107 km/h?

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- Joe BahamasLv 41 year ago
Change v = 107 km/h to m/s

(107*1000)/(60*60) = 535/18 or 29.722 m/s

Kinetic energy = ½ mv2

KE = ½ * 1525 * (535/18) 2

KE = 673600 J

- Andrew SmithLv 71 year ago
All our formulae work for SI units only

Other units including Imperial, US, and "common" units require conversion factors or conversions.

IN EVERY CASE you should consider converting to SI units first then and only then attempting the problem.

In this situation 107 km -> 107000m

and 1 hour -> 60 * 60 = 3600 s

speed = distance / time = 107000/3600 m/s

NOW you are ready to start the physics.

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