Test whether constant incline is constant acceleration

[BuhRock]

1. A car rolls down such an incline from rest, starting at different positions on the incline.
If the car coasts distances of .7430036cm, .9169641cm, 2.025999cm, and 1.61088cm, starting from rest each time and requires respective times of 3.5 sec, 7 sec, 7.25 sec, and 7.75 sec, is there evidence that acceleration is constant.
2. s = v0(t) + .5at^2
3. I used that equation for each interval and found 4 accelerations. The respective accelerations were: .12 cm/s^2, .04cm/s^2, .08cm/s^2, .05cm/s^2

I'm not sure how to prove that there is evidence that the acceleration is constant. The accelerations are all close together though.

 

[SammyS]

The accelerations are very different. 0.12 is 4 times 0.04 .

B.T.W.: The 0.04 cm/s² acceleration is 0.037 cm/s² to 2 sig. figs.

 

[BuhRock]

So when is asks if there is evidence that acceleration is constant, how do I need to prove that?

 

[SammyS]

With those data, I would say there is evidence that the acceleration is not constant.