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physics

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On an incline plane (raised to 30 degrees) is a block A which has a mass of 10 kg. It is attached to a string which goes through a frictionless massless pulley. attached to the other end of the string is an other Block B. The coefficient of kinetic friction between the mass and the incline plane is .20. Block A slides down the plane at constant speed. What is the mass of the block B?

I know that sincce the veclocity is constant would F=ma become all the forces equal to zero? Or is this the wrong equation?

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