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$\cdot$ When you see a traffic light turn red, you apply the brakes untilyou come to a stop. If your initial speed was $18 \mathrm{m} / \mathrm{s},$ and you wereheading due west, what was your average velocity during braking?Assume constant deceleration.

average velocity $\mathrm{v}_{\mathrm{avg}}=-9 \mathrm{m} / \mathrm{s}$which is negative with respect to constant deceleration

Physics 101 Mechanics

Chapter 2

One-Dimensional Kinematics

Motion Along a Straight Line

Cornell University

Rutgers, The State University of New Jersey

Simon Fraser University

University of Sheffield

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In mathematics, a proof is…

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A car is traveling at $20.…

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Constant AccelerationY…

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A car braked with a consta…

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$\cdots$ Predict/Calculate…

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Okay, So in this problem, we have flying breaks toe are just up. We know that our initial velocity is 18 meters per seconds. Nissho velocity. And we know most importantly that during the break we have constant deceleration on the problem. Wants to know what is the average velocity off the car during the break. Okay, we know that when we have constant deceleration or acceleration, the average velocity can be calculated us in half, off the initial velocity plus final velocity. So the final velocity zero So are average velocity is just 18th divided by two. And this is nine meters per second. The answer is actually minus knife meters per second. Because off deceleration, we're not accelerating. We are decelerating. So this is the final answer. Thanks for watching.

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