The incline has height of 21 m and is at an angle of 19, Physics

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The incline has height of 21 m and is at an angle of 19

The incline has height of 2.1 m and is at an angle of 19 degrees above the horizontal. It is allowed to slide down the incline.

A) What is the kinetic energy, potential energy, and the total mechanical energy of the block at the top of the incline?

B) What are they at the bottom of the incline?

C) If this incline were not smooth, the velocity of the block at the bottom of the incline would be 4.1 m/s. How much work was done by friction on the block?

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Physics: The incline has height of 21 m and is at an angle of 19

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