25) This problem asks us to find the acceleration of the object at t=5 seconds. The problem presents us with a lot of unnecessary information to throw us off. All we need to take from this is that at t=5 seconds, there will be a 10 N force in the x-direction and a 10 N force in the negative x-direction. We can draw a simple force diagram for this.
Next, we can write an equation of the sum of the forces in the x-direction.
Finally, we can plug in our values and solve for the acceleration.
Answer: A
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