Avg force on car during crash test?

[IDKPhysics101]

In a crash test a car with mass 746.9 kg collides with a wall and recoils backwards. The velocity of the car before the collision is 36.8 m/s and the velocity after the collision is -20.8 m/s. What is the average force (in N) on the car if the collision lasted for 0.85 sec?

 

[IDKPhysics101]

50613.45n?

 

[venkatg]

Yes correct!

F * t = change in momentum = m(v1 + v2)

F * 0.85 = 746.9 * 57.6

So F = 50613N