1. Speedometer readings for a motorcycle at 12-second intervals are given in the table. t (s) 0 12 24 36 4860 (n/s) 30 28 25 22 24 27 (a) Estimate the distance traveled by the motorcycle during this time period using the velocities at the beginning of the time intervals. (b) Give another estimate using the velocities at th (c) Are your estimates in parts (a) and (b) upper and lower estimates? Explain.