Three point masses- finding center of mass

Question

Three point masses lie in a plane and are connected by masses rods so that they cannot move relative to each other. The masses and their positions are:

m₁ = 2.1 kg at (-9 m, -3 m)

m₂ = 2.6 kg at (5 m, 10 m)

m₃ = 4.1 kg at (-9 m, -5 m)

Calculate the location of this system's center of mass.

The location of center of mass is (   m,   m)

Answer 1

To find the x-coordinate of center of mass we will use the formula

                                                              x_cm = (x₁m₁ + x₂m₂ + x₃m₃) / M

Similarly

                                                     y_cm = (y₁m₁ + y₂m₂ + y₃m₃ ) / M  

M = m₁ + m₂ + m₃ - the total mass of the system of 3 particles.

Now put the numbers and get the answer. If my calculator is not mean to me on Sunday, your answers should be

                                              x_cm = - 4.9 m                            y_cm = - 0. 09 m     

I believe you misspelled one word. The rods must be massless.