# Mass, Acceleration, and Force

The Problem:

(a) A car of mass m is on an icy driveway inclined at an angle of 20$^{\circ}$, Determine the acceleration of the car, assuming that the incline is frictionless.

The questions is followed with an answer:

(a) 3.35 m/s^2

When I worked the problem I set up a free body-diagram with the normal force pointed upwards on the y-axis and the force of gravity in the 4th quadrant at a 20$^{\circ}$ to the y-axis.

However, without knowing the mass of the car I could not solve the problem. Does the mass not matter or was this just an error on part of the book?