Problem B2:
Three small objects lie on the x-axis. The one on the left has a mass of
(n_{1}m). The one in the middle has a mass of m, and the one on the
right has a mass of (n_{2}m). The left object is located a distance of
d to the left and the right object a distance of 2d to the right of the middle
object. If the force on the object in the middle is **F** = n_{3}
Gm^{2}/d^{2}**i**, what is n_{3}? Note that all
the integers are unitless, and the unit vector **i** points to the right.

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