A box of mass 3.06 kg slides down a rough vertical wall. The gravitational force on the box is 30 N. When the box reaches a speed of 2.5 m/s, you start pushing on one edge of the box at a 45° angle (*use degrees* in your calculations throughout this problem) with a constant force of magnitude *F*_{p} = 23 N, as shown in (Figure 1). There is now a frictional force between the box and the wall of magnitude 13 N. How fast is the box sliding 2.8 s after you started pushing on it?

Find the box's speed *v*_{f} at 2.8 s after you first started pushing on it.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Vertical Motion & Free Fall concept. If you need more Vertical Motion & Free Fall practice, you can also practice Vertical Motion & Free Fall practice problems.