Sophia exerts a steady 40-N horizontal force on a 8-kg box resting on a lab bench. The box slides against a horizontal friction force of 24 N. Show that the box accelerates at 2 m/s2.

f=ma where f is force, m is mass, and a is acceleration.The net force is 40-24=16N and the box is 8kg.You can rearranage f=ma to make a the subject by dividing by m, so f/m=a16/8=2m/s^2