The horizontal surface on which the objects slide is frictionless. The acceleration of gravity is 9.8 m/s2. block 1 is 1kg block 2 is 9kg block 3 is 4kg from left to right. If Fl = 20 N and Fr = 7 N, what is the magnitude of the force exerted on the block with mass 9 kg by the block with mass 4 kg? Answer in units of N.
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