A1200 kg test car is traveling at 25 m/s when it crashes head on into a wall and comes to a stop. if the time of impact is 0.04 s, what is the force acting on the car?

Force is the rate of change of momentum.

Initial momentum = 1200 kg * 25 m/s = 30000 kg-m/s

final momentum = 1200 kg * 0 m/s = 0 kg-m/s

Force = rate of change of momentum

= (0-30000)/0.04  kg-m/s^2

=750,000 kg-m/s^2

=750  kN

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im sure the answer is c

answer: frenchlearn.com

explanation: because that's how i learned french.