The graph and the table provided show the height and the speed vs position along the track in the roller coaster.

Question: Does the uphill or downhill direction matter to the speed of the marble, or is the height the contributing variable?

Position Height Time from Photogate A Distance Traveled 5 34.5 Position Speed Of Marble Height 0.0436 1.9 10 5 37 43.58 34.5 0.0237 1.9 10 15 33.5 80.17 37 0.0191 20 1.9 15 25.5 99.48 33.5 0.0157 1.9 25 20 121.02 25.5 23 0.0142 1.9 25 30 9.5 133.80 23 0.0122 1.9 30 35 6.5 155.74 9.5 0.0119 1.9 35 40 159.66 6.5 5 0.0115 1.9 40 45 165.22 4.5 0.0114 1.9 45 166.67 50 5.5 4.5 0.0081 1.9 50 55 234.57 5.5 8 0.0085 1.9 55 223.53 8 60 21 0.0136 1.9 60 139.71 21 65 24.5 0.0173 1.9 65 109.83 24.5 70 27.5 0.0223 1.9 70 85.20 27.5 75 30 0.0309 1.9 75 61.49 80 30 32 0.0335 1.9 80 56.72 32 85 31.5 0.0332 1.9 85 57.23 31.5 90 30.5 0.0264 1.9 90 71.97 30.5 95 28 0.0211 1.9 95 90.05 28 100 25 0.0161 1.9 100 118.01 25 105 22 0.0142 1.9 105 133.80 22 110 18.5 0.0125 1.9 110 152.00 18.5 115 15 0.0116 1.9 115 163.79 15 120 12.5 0.0111 1.9 120 171.17 12.5 125 11 0.0109 1.9 125 174.31 11Height and Speed vs. Position 250 240 230 220 210 200 190 180 170 . (cm) 160 150 140 130 Speed (cm/sec) 120 110 .6898588888 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 Position (cm) . Speed Of Marble . Height