the lab involves an air hockey tab set up on a slight angle (one side is raised by a textbook) and the puck is pushed in such a way as to create what looks like a parabolic shape on the paper with carbon markings. The point is to determine if the motion is a projectile motion. So far, my group has calculating the velocity in the x- direction, but we're stumped as how to find acceleration in the y-direction, due to the fact that the table is on a slight slant. the force of friction is negilible against the puck and the table because of the force of air (hence the name air hockey). What i want is some idea of how to calculate the acceleratation due to gravity. a formula or steps would be nice... we can take it from there. thanks.