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Two crates, of mass m1 = 60 kg and m2 = 130 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 60 kg crate. The coefficient of kinetic friction is 0.15.
(a) Calculate the acceleration of the system.(to the right)
(b) Calculate the force that each crate exerts on the other.

(c) Repeat with the crates reversed.
Find acceleration and crate force.

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