A box is dropped on a level conveyor belt that is moving at 4.5 m/s in the +x direction in a shipping facility.  The box/belt friction coefficient is 0.15.  For what duration will the box slide on the belt?  In which direction does the friction force act on the box?  How far will the box have moved horizontally by the time it stops sliding along the belt?

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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.