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When a weight made the wooden cart accelerate up the table (and herself down), the velocity of the cart was doing this: -0.0 Linear X x range: 4.633 - 7.698 s y = mx +b X Velocity (m/s) m = -0.090 b = 0.306 r=-0.979 RMSE = 0.017 0.3 -0.4 6 1 1 8 101 Time (s) From this graph we conclude that the velocity... Select one: a. changed but with fixed acceleration b. did not change c. changed in a messy and unpredictable way d. changed, but with varying acceleration