Question: In Figure a, a constant horizontal force Fa is applied to block, 4, which pushes against block B with a 20.0N force directed horizontally to

In Figure a, a constant horizontal force Fa is applied to block, 4, which pushes against block B with a 20.0N force directed horizontally to the right. In Figure b, the same force Fa is applied to block B; now block, A pushes on block B with a 10.0 N force directed horizontally to the left. The blocks have a combined mass of 12.0 kg. What are the magnitudes of?

(a) Their acceleration in Figure a and

(b) Force Fa?

A B B A (a) (6)

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