A car starts from rest and travels for 10.0 s with a uniform acceleration of +1.9 m/s². The driver then applies the brakes, causing a uniform acceleration of -2.5 m/s². If the brakes are applied for 1.0 s, determine each of the following. (a) How fast is the car going at the end of the braking period? m/s (b) How far has the car gone? m

College Physics
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Chapter1: Units, Trigonometry. And Vectors
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A car starts from rest and travels for 10.0 s with a uniform acceleration of +1.9 m/s². The driver then applies the brakes,
causing a uniform acceleration of -2.5 m/s². If the brakes are applied for 1.0 s, determine each of the following.
(a) How fast is the car going at the end of the braking period?
m/s
(b) How far has the car gone?
m
Transcribed Image Text:A car starts from rest and travels for 10.0 s with a uniform acceleration of +1.9 m/s². The driver then applies the brakes, causing a uniform acceleration of -2.5 m/s². If the brakes are applied for 1.0 s, determine each of the following. (a) How fast is the car going at the end of the braking period? m/s (b) How far has the car gone? m
Expert Solution
Step 1: Introduction

For straight-line motions with constant acceleration, we use Newton's equations of motion. The negative acceleration is called deceleration or retardation. 

If we apply brakes in a car, retardation takes place or the car's velocity decreases uniformly in equal intervals of time.

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