An object of unknown mass is acted upon by multiple forces:

• \(100 \, \text{N}\) to the right at \(20^\circ\)
• \(400 \, \text{N}\) to the left at \(40^\circ\) below the horizontal
• \(500 \, \text{N}\) to the right at \(10^\circ\) below the horizontal

The coefficients of friction are \(\mu_s = 0.6\) and \(\mu_k = 0.2\). Starting from rest, the object travels \(10 \, \text{m}\) in \(4.5 \, \text{s}\). What is the mass of the unknown object?