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physical

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a crate rest on a ramp that makes an angle of tangent with the horizontal.the coefficient of kinetic friction is 0.35 and the coefficient of static friction is 0.45.the inclination of the ramp is slowly increased.(a)find the angle at which the crate starts to slip down the ramp.(B)find the angle at which the crate slips down at constant velocity once motion has started.

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