Posted by **Sharon kay** on Monday, June 25, 2007 at 2:39pm.

An automobile traveling at 25km/hour has kinetic energy equal to 1x10 to the fourth power J. What is the mass of the car?

K.E. = (1/2)M V^2 = 10^4 J

Convert the speed to m/s and them use that V to solve for the mass of the car, in kg.

V = 25000 m/hr x (1 hr/3600 s) = _____ m/s

M = 2x(KE)/V^2 = ___ kg

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