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Then, explain your reasoning. a. s highest point, its velocity is zero. b. s highest point, its acceleration is zero. c. The rate of change of the position is changing with time along the projectile path. d. The rate of change of the position is changing with time along the projectile path. e. Suppose that after , an object has traveled in the horizontal direction. If the object is in projectile motion, it must travel in the vertical direction as well. f. Suppose a hunter fires his gun. Suppose as well that as the bullet flies out horizontally and undergoes projectile motion, the shell for the bullet falls directly downward.

99 m/s 4. a. b. 108 m/s 5. a. 450,000 J b. 22,500 J c. 5,625 J d. 2 m/s e. 18 m 6. 7. b. 8. a. b. 9. a. 7 J b. 3 m/s c. 63 m/s 10. a. b. 130 J 11. a. 6750 J b. c. 12. 12. 76 m Chapter 3: One-Dimensional Motion The Big Idea One dimensional motion describes objects moving in straight lines. Speed is a scalar measure of how quickly an object is moving along this line Velocity is speed with a direction, making it a vector. If an object舗s velocity changes with time, the object is said to be accelerating.

10. A toy truck moves off the edge of a table that is high and lands from the base of the table. a. How much time passed between the moment the car left the table and the moment it hit the floor? b. What was the horizontal velocity of the car when it hit the ground? 11. A hawk in level flight above the ground drops the fish it caught. s horizontal speed is , how far ahead of the drop point will the fish land? 12. A pistol is fired horizontally toward a target away, but at the same height. s velocity is .