How much force does the 4 kg block exert on the 6 kg block?

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Blocks with masses of 2 kg, 4 kg and 6 kg are lined up in a row on a frictionless table. All three are pushed forward by a 58 N force applied to the 2 kg block.

  1. How much force does the 4 kg block exert on the 6 kg block?
  2. How much force does the 4 kg block exert on the 2 kg block?