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On a planet having g= 10m/s^2, a 2kg mass, starting from rest, slides down a frictionless...

On a planet having g= 10m/s^2, a 2kg mass, starting from rest, slides down a frictionless in life on to a frictionless horizontal surface. The speed of the mass on the horizontal surface is 10m/s.

A) Determine the height h at which the box began its slide.

consider again the same frictionless incline. However, upon reaching the horizontal surface, a surface having friction is encountered.

B) If when the mass starts from the same height as in part A), the final speed is instead 6m/s after moving 10 meters on the horizontal surface having friction, what is the work done by friction in these 10 m?

C) determine the coefficient of kinetic friction between the block and the  horizontal surface having friction

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