Kinematics Problems

1. A Porsche accelerates from a stoplight at 8 m/s/s for 5 seconds, then coasts for 3 more seconds. How far has it traveled?

2. You are standing still as Fast Fred runs past you with the football at a speed of 10 m/s. He has only 30 m left before reaching the goal line to score the winning touchdown.

a. If you begin running at the exact instant he passes you, what acceleration must you maintain to catch Fred at the 5 m line?

b. What speed will you have as you tackle him?