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A block slides down a frictionless ramp, which makes a 30 degree angle to the horizontal...

A block slides down a frictionless ramp, which makes a 30 degree angle to the horizontal floor. The block slides the full 180m all the way down the ramp, where it encounters a flat surface with friction. It slides for 250m before it finally comes to rest.

a.) what is the speed at the bottom of the ramp?

b.) What is the coefficient of friction on the flat surface?

c.) What is the total time the block was in in motion?

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