Three objects of equal mass

m₁=m₂=m₃=1.20kg

are located on the vertices of an equilateral triangle of length

d=3.60m.

A fourth mass

m₄= 15.5 kg

is at the center of the triangle. What is the net gravitational force on the mass

m₁

that is at the origin? Express your answer in vector form.

F_net

=

N