1. a. A runner starts from rest and in 2 s reaches a speed of 10 m/s. If we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 2 s interval? -average speed=_______m/s   b. How far did the runner go in this 2 s interval? - distance= _____m   2. Which of the following descriptions best describes the motion map of a tennis ball rolling off a table? a. The y velocity arrows stay the same length. b. The y velocity arrows get longer. c. The x velocity arrows get longer. d. The x velocity arrows stay the same length e. The y velocity arrows get shorter.

College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter2: Kinematics
Section: Chapter Questions
Problem 23PE: (a) A light-rail commuter train accelerates at a rate of 1.35 m/s2. How long does it take to reach...
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1. a. A runner starts from rest and in 2 s reaches a speed of 10 m/s. If we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 2 s interval?

-average speed=_______m/s

  b. How far did the runner go in this 2 s interval?

- distance= _____m

 

2. Which of the following descriptions best describes the motion map of a tennis ball rolling off a table?

a. The y velocity arrows stay the same length.

b. The y velocity arrows get longer.

c. The x velocity arrows get longer.

d. The x velocity arrows stay the same length

e. The y velocity arrows get shorter.

f. The x velocity arrows get shorter

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