# Homework Help: Test whether constant incline is constant acceleration

1. Oct 13, 2011

### 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.

Last edited: Oct 13, 2011
2. Oct 13, 2011

### SammyS

Staff Emeritus
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.

3. Oct 13, 2011

### BuhRock

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

4. Oct 13, 2011

### SammyS

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