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The figure below shows two blocks A and B with masses
ma = 4.0 kg and mg = 20 kg moving together under the
influence of a constant force of 36 N applied directly to block
A. The blocks are moving over a rough horizontal surface with
coefficient of kinetic friction µr = 0.2. Find the magnitude of
the force that block A exerts on block B.
ma = 4.0 kg
m3 = 20 kg
36 N
A
B

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