Homework Help: physics

Posted by rex on Wednesday, April 20, 2011 at 2:02pm.

A 5.0-kg block at rest on a frictionless surface is acted
on by forces F1 = 5.5 N
and F2 = 3.5 N. What additional horizontal force will
keep the block at rest?

Answer: F3 = (-7.6 N)

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