A box of mass 3.0 kg slides down a rough vertical wall. The gravitational force on the box is 29.4 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 FpFpF_p = 23.0 N , as shown in (Figure 1). There is now a frictional force between the box and the wall of magnitude 13.0 N . How fast is the box sliding 2.6 s after you started pushing on it?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.