How to calculate percentage difference between two accelerations of a toy car?

I had to do an experiment whereby we calculated the acceleration of two toy cars, traveling down a slope. One on sandpaper surface and one on smooth surface. Now we are trying to calculate the percentage difference between the two. The acceleration rate on the sandpaper surface is 0.9152m/s/s and the rate for the smooth surface is 1.4194m/s/s. Can anyone help me?How to calculate percentage difference between two accelerations of a toy car?% Diff = | (x1 - x2)/[ (x1 + x2)/2 ] | x 100



= | (1.4194 - 0.9152)/[ (1.4194 + 0.9152)/2 ] | x 100



= | (0.5042)/ [ (2.3346)/2 ] | x 100



= | (0.5042)/(1.1673) | x 100



= 43.19 %

yamaha atv