You do the net force by subtracting the sides. The direction of the box is moving forward to the right by 10 N.
The dogs centripetal acceleration is 2.4 meters/second^2
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Answer:

Explanation:
ΣF=ma
The two forces at play are the force applied and the force due to friction. As they are opposing forces set the direction being pushed as the positive in the x direction. the equation you come out with is 60 - 15=(15)A (we know mass to be 15kg). Solve for 3 m/s^2.