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OpenStudy (anonymous):
Cars are tested by smashing them into fixed, barriers at 50km/h. A new model of mass 1500kg takes .15s from the time of impact to the time of rest. Calculate the average force exerted on the car by the barrier and the average deceleration of the car.
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OpenStudy (jamesj):
\[ F \Delta t = \Delta p \] where F is force, t is time and p is momentum. You should now be able to do it.
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