bowling ball is dropped from the top of a building that has a height of h = 155 m. 1.Assuming air resistance is negligible, what is the ball's speed, vf in m/s, when it strikes the ground?  2.If drag produces an opposing force of 10 N while the ball's falling, what is the ball's speed, vf in m/s, when it strikes the ground? Assume the ball has a mass of 5 kg.  3.A different ball was dropped and the final speed was measured to be vf = 7.5 m/s while the drag force was measured to be 50 Newtons. What is the mass of this ball in kg?

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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.