The force of gravity runs parallel to the ramp, so we’ll need to use some trig to find the force. Normally the force acting on the mass is

F = ma

F = (3 kg)(9.81 m/s^2)

F = 29.43 N

But since we’re on an incline, we need to find the force along the ramp:

Fg = F * sin 32

Fg = 29.43 N * sin 32

Fg = 15.6 N

The force resulting from friction requires us to use the force of the mass acting perpendicular to the ramp. So,

Fn = F * cos 32

Fn = 29.43 N * cos 32

Fn = 24.96 N

Ff = µ * Fn

Ff = 0.15 * 24.96 N

Ff = 3.73 N

So the resulting force of the block is

Fr = Fg – Ff

Fr = 15.6 N – 3.73 N

Fr = 11.87 N

Finally, we can find the acceleration:

F = ma

11.87 N = 3 kg * a

a = 3.96 m/s^2