A boy is initially seated on the top of a hemispherical ice mound of radius R 13.8 m. He begins to slide down the ice, with a negligible initial speed Approximate the ice as being frictionless. At what height does the boy lose contact with the ice?

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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.