11. At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.2 m/s². At the same instant a truck, traveling with a constant speed of 9.5 m/s, overtakes and passes the automobile. a) How far beyond the traffic signal will the automobile overtake the truck? b) How fast will the automobile be traveling at that instant?

Physics for Scientists and Engineers, Technology Update (No access codes included)
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Chapter4: Motion In Two Dimensions
Section: Chapter Questions
Problem 4.46P: A moving beltway at an airport has a speed 1 and a length L. A woman stands on the beltway as it...
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11:24 PM
O 30%
moodle.ubishops.ca
4 of 21
4
8.
12
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16
Time (s)
11. At the instant the traffic light turns green, an automobile starts with a constant
acceleration a of 2.2 m/s. At the same instant a truck, traveling with a constant speed of
9.5 m/s, overtakes and passes the automobile.
a) How far beyond the traffic signal will the automobile overtake the truck?
b) How fast will the automobile be traveling at that instant?
12. A red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward
each other along a straight, level track. When they are 950 m apart, each engineer sees
the other's train and applies the brakes. The brakes slow each train at the rate of 1.0 m/s².
Is there a collision? If so, answer yes and give the speed of the red train and the speed of
the green train at impact, respectively. If not, answer no and give the separation between
the trains when they stop.
72 km/h
144 km/h
RED
+x
GREEN
950 m
X 950 m
G,o
13. A person throws a stone vertically downward with an initial speed of 12.0 m/s from the
roof of a building 30.0 m above the ground.
a) How long does it take the stone to reach the ground?
b) What is the speed of the stone at impact?
Velocity (m/s
Transcribed Image Text:No Service 11:24 PM O 30% moodle.ubishops.ca 4 of 21 4 8. 12 t 16 Time (s) 11. At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.2 m/s. At the same instant a truck, traveling with a constant speed of 9.5 m/s, overtakes and passes the automobile. a) How far beyond the traffic signal will the automobile overtake the truck? b) How fast will the automobile be traveling at that instant? 12. A red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward each other along a straight, level track. When they are 950 m apart, each engineer sees the other's train and applies the brakes. The brakes slow each train at the rate of 1.0 m/s². Is there a collision? If so, answer yes and give the speed of the red train and the speed of the green train at impact, respectively. If not, answer no and give the separation between the trains when they stop. 72 km/h 144 km/h RED +x GREEN 950 m X 950 m G,o 13. A person throws a stone vertically downward with an initial speed of 12.0 m/s from the roof of a building 30.0 m above the ground. a) How long does it take the stone to reach the ground? b) What is the speed of the stone at impact? Velocity (m/s
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