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September 22, 2014

September 22, 2014

Posted by **Debbie** on Friday, March 30, 2012 at 1:39pm.

calculate the kinetic energy in joules of an automobile weighing 2135lb and traveling at 55 mph (1 mile=1.6093km, 1lb=453.59g)

- Chem 2 -
**Steve**, Friday, March 30, 2012 at 2:46pmjust use the formula:

KE = 1/2 mv^2

m = 2135 lb*.45359 kg/lb = 968.4 kg

v = 55 mi/hr * 1609.3 m/mi * 1 hr/3600s = 24.59 m/s

KE = .5 * 968.4 * 24.59^{2}kg-m^2/s^2 = 292780J = 292.78kJ

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