Three equilateral masses m are placed at the three corners of an eq. triangle of side a.Find the force exerted by this system on another particle of mass m placed at the mid point of a side.

Question

dls · Answer

http://gyazo.com/0c7bcaa88b6ee9f2b299f78034e74a7c did everything in that solution,but what happened at the end? why did we divide by 3?just want to be sure..

dls · Answer

@Vincent-Lyon.Fr

vincent-lyon.fr · Answer

The answer is $\LARGE\frac{4Gm^2}{3a^2}$