6. A car is braking, and its velocity, measured in meters per second, t seconds after the brakes are applied is given in the table below. 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 U 30 20 15 10 6 4 2 1 0.5 (a) Give an upper estimate for the distance traveled during the first 4 seconds after the brakes were applied. (b) Give a lower estimate for the distance traveled during the first 4 seconds after the brakes were applied