Question 2:  #80  In a physics lab experiment, a spring clamped to the table shoots a 20 g ball horizontally.  When the spring is compressed 20 cm, the ball travels horizontally 5.0 m and lands on the floor 1.5 m below the point at which it left the spring.  What is the spring constant?

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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.