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?
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?
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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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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