Homework Help: physics

Posted by john on Friday, September 25, 2009 at 12:36am.

in an air bag test a car traveling at 100km/h is remotely driven into a brick wall. suppose an identical car is dropped onto a hard surface. from what height would the car have to be dropped to have the same impact that with the brick wall?

physics - MathMate, Friday, September 25, 2009 at 7:24am
100 km/h = 100000/3600 = 27.78 m/s
Equate kinetic energy to potential energy at equivalent height, h
mgh = (1/2)mv²
h=v²/(2g)
=27.78²/(2*9.8)
=39.4 m

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