A test object of mass (m_{text {test }}) is placed at the origin of a two-dimensional coordinate

Question:

A test object of mass $m_{\text {test }}$ is placed at the origin of a two-dimensional coordinate system (Figure P13.33). An object 1 , of the same mass, is at (d, 0), and an object 2 , of mass $2 m_{\text {test }}$ is at (-d, l). What is the magnitude of the vector sum of the gravitational forces exerted on the test object by the other two objects?

Data from Figure P13.33

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