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posted by Anna Tuesday, May 3, 2011 at 12:59pm.
A 7-kg brick is dragged across the floor by a horizontal force of 42 N. If a frictional force of 18 N also acts on the brick, what is its acceleration?
Fnet = m a a = Fnet/m = (42 - 18)/7 = 3.4 m/s^2
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