A 6 kg mass slides to the right on a surface having a coefficient of friction of 0.48 as shown in the figure. The mass has a speed of 8 m/s when contact is made with a spring that has a spring constant of 145 N/m. The mass comes to rest after the spring has been compressed a distance d. The mass is then forced toward the left by the spring and continues to move in that direction beyond the unstretched position. Finally, the mass comes to rest at a distance D to the left of the unstretched spring. Find the distance D where the mass comes to rest in m. The acceleration due to gravity is 9.8 m/s2

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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.