what is the effect that distance, mass, and height of the ramp have on acceleration of a toy car?

Question

it would be nice you if you could back up your findings and including your answer a definition of acceleration.

Answer 1

Hmmm...?
You must be kidding.

The angle the ramp is inclined A is

sin(A) =h/S
h - ramp's height
S - ramp's length

The acceleration = downward force over mass of the car
a=F/m
the downward force is
F=mg sin(A) /m so

a= mg sin(a)/m
a=g (h/S)