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So I know I have to find the force I'm going to need acceleration, and to find it I'll need to use a kinematic equation. So this is where the confusion comes in.

The correct way to do it is v^2= U^2 + 2ad, and isolate the a. The answer to this would be 4.22 m/s^2. Then we can find the force by plugging it in, f=(4.22)(93)= 392 Newtons

But why couldn't I use this kinematic equation and solve for a?

x=x

_{0}+ v

_{0}t + 1/2(a)t^2)

20=0+0+1/2(a)(16)

20=8a

20/8 = a

Sorry if this seems like a dumb question but I think all the different letters and their meanings are getting a little confusing.

Or this one, acceleration = delta V / Delta T, couldn't you just do 13-0 / 4-0? so its 13/4?