Suppose a police officer is 1/2 mi the intersection at 45 mph. At the intersection, driving east (away fr officer's radar gun indicates 20 m straight-line distance between th of 20 mph). What is the speed of Speed = mph.

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter4: Motion In Two And Three Dimensions
Section: Chapter Questions
Problem 76P: A small plane flies at 200 km/h in still air. If the wind blows directly out of the west at 50 km/h,...
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Suppose a police officer is 1/2 mile south of an intersection, driving north towards
the intersection at 45 mph. At the same time, another car is 1/2 mile east of the
intersection, driving east (away from the intersection) at an unknown speed. The
officer's radar gun indicates 20 mph when pointed at the other car (that is, the
straight-line distance between the officer and the other car is increasing at a rate
of 20 mph). What is the speed of the other car?
Speed = mph.
Speed:
=
Now suppose that the officer's radar gun indicates -20 mph instead (that is, the
straight-line distance is decreasing at a rate of 20 mph). What is the speed of the
other car this time?
E
mph.
Transcribed Image Text:W N S Suppose a police officer is 1/2 mile south of an intersection, driving north towards the intersection at 45 mph. At the same time, another car is 1/2 mile east of the intersection, driving east (away from the intersection) at an unknown speed. The officer's radar gun indicates 20 mph when pointed at the other car (that is, the straight-line distance between the officer and the other car is increasing at a rate of 20 mph). What is the speed of the other car? Speed = mph. Speed: = Now suppose that the officer's radar gun indicates -20 mph instead (that is, the straight-line distance is decreasing at a rate of 20 mph). What is the speed of the other car this time? E mph.
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