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A block of mass 1 kg is initially at rest at a height of 5 m...

A block of mass 1 kg is initially at rest at a height of 5 m from the ground, on an inclined surface of angle of 30° (above horizon). The block slides down and
reaches the ground with speed of 7 ???? . What is the coefficient of kinetic friction?
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Answer #1

The length of the incline is

The force on the block as it slides down is

The change is potential energy is

This is equal to the kinetic energy at the bottom of the incline

Solving this gives the coefficient of kinetic friction

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