235 kg roller coaster is at the top of a hill with a velocity of 5.60 m/s from a height of 100.0 m above the ground. A) Determine the velocity of the roller coaster at a height of 40.0 m further down the track, neglecting friction.  B) What reference point did you choose as zero height? Show how you could come up with the same answer to A if you chose another reference point for height.

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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.