A motorist is travelling at 72km/hr when he observes that a traffic light ahead turns red. The traffic light is timed to stay red for 22 seconds. If the motorists pass the light without stopping just as it turns green again, determine a) the re uniform deceleration of the car in m/s^2 b) the speed of the car in m/s as it pa light.

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter6: Motion In Two Dimensions
Section: Chapter Questions
Problem 84A
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A motorist is travelling at 72km/hr when he observes that a traffic light ahead of him
turns red. The traffic light is timed to stay red for 22 seconds. If the motorists wishes to
pass the light without stopping just as it turns green again, determine a) the required
uniform deceleration of the car in m/s^2 b) the speed of the car in m/s as it passes the
light.
300m
v = 72km/hr
Transcribed Image Text:A motorist is travelling at 72km/hr when he observes that a traffic light ahead of him turns red. The traffic light is timed to stay red for 22 seconds. If the motorists wishes to pass the light without stopping just as it turns green again, determine a) the required uniform deceleration of the car in m/s^2 b) the speed of the car in m/s as it passes the light. 300m v = 72km/hr
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