An 8 kg block initially at rest is pulled to the right for 3 m with a force of 12 N over a surface. Determine its final speed if: (a) the surface has no friction and (b) the surface has a coefficient of kinetic friction of 0.15

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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.