First find Fn on the 2 kg mass. Net force along an axis perpendicular to the ramp surface is 0, so:
Fn + Fgcos40 = 0
Fn + (-9.81)(2)cos40 = 0
Solve for Fn
Now work out net force of system:
Fa + Fgsin40 + Fk
= 9.81(1) + (-9.81)(2)sin40 + (0.3)(Fn)
Plug in Fn that you found above to get net force of the system.
Divide net force by total mass of system (3kg) to get system acceleration.
An object of mass 2kg on a plane inclined at angle 40degree and whose coefficient of dynamic friction is 0.3 is connected to another mass of 1kg which hangs vertically over a frictionless pulley. Obtain the acceleration of the system
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