4. A car is travelling at 10 m.s when the driver sees a police car. The driver brakes and decelerates at 4 m.s² for 2 seconds. After 2 seconds of braking, the driver is confident that the police have not seen him so speeds up again to his original speed in 4 seconds and then maintains his original speed.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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W Mot X
DThe X G dece X
x C
G dece x S
S Stud X
E Grac X
Grac XE Grac X G mot X
G net X
G g to X
Revi X
a classroom.google.com/u/0/c/M]Y4MTUXMDQ3MZQZ/a/MzExODMzNzQwOTQw/details
c) What is the average velocity of each car for the first 10s?
4. A car is travelling at 10 m.s when the driver sees a police car. The driver brakes and decelerates at 4 m.s for 2
seconds. After 2 seconds of braking, the driver is confident that the police have not seen him so speeds up again to his
original speed in 4 seconds and then maintains his original speed.
10
6.
8.
7.
5.
41
2.
1.
0 1 2 3
4 5
Time (s)
a) What is the acceleration when the driver is speeding up again?
9.
7 8 9
10
b) What is lowest instantaneous velocity of the car and at what time does it occur?
c) What is the displacement of the car travel under braking?
Type here to search
6,
3.
Velocity (m/s)
Transcribed Image Text:W Mot X DThe X G dece X x C G dece x S S Stud X E Grac X Grac XE Grac X G mot X G net X G g to X Revi X a classroom.google.com/u/0/c/M]Y4MTUXMDQ3MZQZ/a/MzExODMzNzQwOTQw/details c) What is the average velocity of each car for the first 10s? 4. A car is travelling at 10 m.s when the driver sees a police car. The driver brakes and decelerates at 4 m.s for 2 seconds. After 2 seconds of braking, the driver is confident that the police have not seen him so speeds up again to his original speed in 4 seconds and then maintains his original speed. 10 6. 8. 7. 5. 41 2. 1. 0 1 2 3 4 5 Time (s) a) What is the acceleration when the driver is speeding up again? 9. 7 8 9 10 b) What is lowest instantaneous velocity of the car and at what time does it occur? c) What is the displacement of the car travel under braking? Type here to search 6, 3. Velocity (m/s)
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