I got the answer and it says its wrong so i tried the answeragain in the positiv

Question

I got the answer and it says its wrong so i tried the answeragain in the positive and it says thats wrong too. i don't knowwhat i'm doing or where i'm going wrong!
Airplane flight recorders must be able to survive catastrophiccrashes. Therefore, they are typically encased in crash-resistantsteel or titanium boxes that are subjected to rigorous testing. Oneof the tests is an impact shock test, in which the box must survivebeing thrown at high speeds against a barrier. A 42-kg box isthrown at a speed of 370 m/s and is brought to a halt in acollision that lasts for a time of 8.4 ms. What is the magnitude ofthe average net force that acts on the box during the collision? I got the answer and it says its wrong so i tried the answeragain in the positive and it says thats wrong too. i don't knowwhat i'm doing or where i'm going wrong!

Explanation / Answer

Momentum of the thrown box p = mv = 42*370 = 15540 F = p/t = 15540/.0084 = 1.85e6 N

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