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- Can you please answer def as a followup if thats allowed?A mass, m is on an incline of angle as shown. It is connected via a string to a pulley of moment of inertia, I, and radius, R. (a) How fast will it be moving when it has moved a distance D down the incline? (b) Now assume that there is friction between the mass and the incline, pk. How fast will it be moving now when it has moved a distance D down the incline?Av a = At Av = v, -v,