Okay i have a physics problem that i really don't get...pliz help me!! A 6.0-kg block rests on top of a 7.0-kg, 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? i tried using the formula F sub a and b = F sub b and a but my book really doesn't explain how to work out the problem...help! bWhat is the force (magnitude and direction) exerted by the 6.0-kg block on the 7.0-kg block?