In summary: I'm not quite sure how to make it not...negative?No. You're getting a negative answer (F= -40000) because the car's final momentum is less than its initial momentum. This doesn't mean anything is wrong.
"Force on of the impact" is not specific enough to know which particular force is asked for. But it probably means that you are only expected to give the magnitude of the force. I harassed you with the sign business mainly to get you to think about the meaning of the signs in your calculation.
#38
Sarah
21
0
ahhh ok that makes sense, and no again you helped a lot and now i can know the why behind it so it really helps