Newton's Laws of Motion

1. The problem statement, all variables and given/known data

A 41-kg box is thrown at a speed of 235 m/s and is brought to a halt in a collision that lasts for a time of 6.8 ms. What is the magnitude of the average net force that acts on the box during the collision?

2. Relevant equations

Sum of Forces = m*a

3. The attempt at a solution

Well I tried t=6.8, v(o) = 235 m/s, v = 0, , and tried to solve for acceleration, which i got -34.56. but putting that in the sum of forces = m*a is not giving me the correct solution. i suck at physics :(
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 Hi alexdude777. Is it the time 6.8 seconds or miliseconds ?
 step one of solving physics problem is to draw a picture, so where's your drawing? and then show your work. plus you can never have a (-) acceleration the (-) sign is just to show the direction.

Newton's Laws of Motion

It's definitely 6.8 milliseconds

Well I did make a drawing but how would I post it here? I mean it was just a box that I labeled 41-kg, with a vector towards the wall labeling the direction and velocity(235m/s), and then hitting a wall. Then I had t=6.8ms on the side

I am terrible at the stuff...I am gonna fail :(

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