Please explain step by step!

A 6.0-kg block rests on top of a 7.0-kg block, which rests on a horizontal table.
a) What is the force (magnitude and direction) exerted by the 7.0-kg block on the 6.0-kg block?
b) What is the force (magnitude and direction) exerted by the 6.0-kg block on the 7.0-kg block?



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