Question

Section 2.1 Uniform Motion 1. I Alan leaves Los Angeles at 8:00 a.m. to drive to San Fran- cisco, 400 mi away. He travels at a steady 50 mph. Beth leaves Los Angeles at 9:00 a.m. and drives a steady 60 mph. a. Who gets to San Francisco first? b. How long does the first to arrive have to wait for the second? 2. I Larry leaves home at 9:05 and runs at constant speed to the lamppost seen in FIGURE EX2.2. He reaches the lamppost at 9:07, immediately turns, and runs to the tree. Larry arrives at the tree at 9:10. a. What is Larry's average velocity, in m/min, during each of these two intervals. b. What is Larry's average velocity for the entire run? x (m) FIGURE EX2.2 0 200 400 600 800 1000 1200 3. l Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 40 mph and half the distance at 60 mph. On her return trip, she drives half the time at 40 mph and half the time at 60 mph. a. What is Julie's average speed on the way to Grandmother's house? b. What is her average speed on the return trip? 4. I FIGURE EX2.4 is the position-versus-time graph of a jogger. what is the jogger's velocity at t = 10 s, at t = 25 s, and at t = 35 s? x (m) 50 25 0 t (s) FIGURE EX2.4 0 10 20 30 40

Answer 1