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A mass of 80 kg stands on a horizontal w...

A mass of `80 kg` stands on a horizontal weight machine of negligible mass , atteched to a massless platform `P` that sliding down at `37^(@)` incline. The ewight machine reads `72 kg` the man is always at rest weight machine calculate

a. the verticle acceleration of the man.
b. the coefficient of kinetic friction `mu` between platform and incline.

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