Chapter 2
1. (p.42 prob.5) You are driving home from school steadily at 65mph for 130miles. It then begins to rain and you slow to 55mph. You arrive home after driving 3 hours and 20 minutes. (a) How far is your hometown from school? (b) What was your average speed?
2. (p.43 prob.11) Calculate the average speed and average velocity of a complete round-trip in which the outgoing 200km is covered at 90km/h, followed by a one-hour lunch break, and return 200km is covered at 50km/h.
3. (p.43 prob.16) A sports car is advertised to be able to stop in a distance of 50m from a speed of 90km/h. What is its acceleration in m/s2? How many g's is this (g = 9.80m/s2)?
4. (p.43 prob.25) A car traveling 45km/h slows down at a constant 0.50m/s2 just by "letting up on the gas." Calculate (a) the distance the car coasts before it stops, (b) the time it takes to stops, and (c) the distance it travels during the first and fifth seconds.
5. (p.44 prob.36) A foul ball is hit straight up into the air with a speed of about 25m/s. (a) How high does it go? (b) How long is it in the air?
6. (p.44 prob.44)A stone is thrown vertically upward with a speed of 20.0m/s. (a) How fast is it moving when it reaches a height of 12.0m? (b) How long is required to reach this height? (c) Why are there two answers to (b)?