1. Velocity is
(a) The distance traveled per unit of time.
(b) The same as speed.
(c) Direction of travel and distance traveled per unit of time.
(d) Only the direction of travel.
2. A large heavy rock and a small marble are dropped at the same time from the roof of a three-story building. Neglecting air resistance, which object will strike the ground first?
(a) The marble.
(b) The rock.
(c) They both strike the ground at the same time.
3. One ball is thrown horizontally while another is dropped vertically. Which ball will strike the ground first?
(a) Both strike the ground at the same time.
(b) The horizontally thrown ball strikes first.
(c) The vertically dropped ball strikes first.
4. At what launch angle with the ground does a projectile have the greatest horizontal range?
(a) 0°
(b) 45°
(c) 60°
(d) 90°
5. Where in a projectile’s path would its speed be the least?
(a) Just as it is launched.
(b) Just before it lands.
(c) It has the same speed throughout its entire motion.
(d) At the top of its path.
6. Explain your answer to Question 2.
7. Explain your answer to Question 3.