You are driving along Lawrence Ave. at 60 km/h. You see the traffic light ahead is still green and decide to speed up to try to make it through the intersection before it turns red (poor decision!). Your car accelerates at 1.3 m/s. You reach the light after accelerating for 4.3 seconds. What is your speed at the light in m/s? V =v, +aAt A: Pictorial Representation Sketch showing events, describe events, coordinate system, label givens & unknowns with symbols, conversions

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter2: Representing Motion
Section: Chapter Questions
Problem 66A
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You are driving along Lawrence Ave. at 60 km/h. You see the traffic light ahead is still green and decide
to speed up to try to make it through the intersection before it turns red (poor decision!). Your car
accelerates at 1.3 m/s. You reach the light after accelerating for 4.3 seconds. What is your speed at
the light in m/s?
V =v, +aAt
A: Pictorial Representation
Sketch showing events, describe events, coordinate system, label givens & unknowns with symbols, conversions
B: Physics Representation
Motion diagram, motion graphs, velocity vectors, events
a
C: Word Representation
Describe motion (no numbers),-assumptions, estimated result (no calculation)
D: Mathematical Representation
Describe physics of steps, complete equations, algebraically isolate, substitutions with units, final statement of prediction
E: Evaluation
Answer has reasonable size, direction and units? Why?
Transcribed Image Text:You are driving along Lawrence Ave. at 60 km/h. You see the traffic light ahead is still green and decide to speed up to try to make it through the intersection before it turns red (poor decision!). Your car accelerates at 1.3 m/s. You reach the light after accelerating for 4.3 seconds. What is your speed at the light in m/s? V =v, +aAt A: Pictorial Representation Sketch showing events, describe events, coordinate system, label givens & unknowns with symbols, conversions B: Physics Representation Motion diagram, motion graphs, velocity vectors, events a C: Word Representation Describe motion (no numbers),-assumptions, estimated result (no calculation) D: Mathematical Representation Describe physics of steps, complete equations, algebraically isolate, substitutions with units, final statement of prediction E: Evaluation Answer has reasonable size, direction and units? Why?
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