Three boxes are pushed across a frictionless horizontal surface as shown. When we compare the normal force 
that mass 2m exerts on mass 5m with the normal force 
that mass 5m exerts on mass 10m, we find that
?
?
A.
= = F.B.
= F> .C.
F> = .
= .D.
F>> .
> .E.
F> > .
> .?
Answer: D
Physics & Space Science
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