If a driver is initially going 21m/s to the left and then slams on the brakes to accelerate at a magnitude of 14.7m/s/s until she comes to a stop. How far did she travel/what was the distance she traveled the moment she started applying the brakes?

If a driver is initially going 21m/s to the left and then slams on the brakes to accelerate at a magnitude of 14.7m/s/s until she comes to a stop. How far did she travel/what was the distance she traveled the moment she started applying the brakes?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter3: Motion Along A Straight Line

Section: Chapter Questions

Problem 2CQ: Under what circumstances does distance traveled equal magnitude of displacement? What is the only...

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

Expert Solution

Step 1

Given that,

Initial speed is u = 21 m/s

As it stops final speed is v = 0 m/s

Magnitude of acceleration is a = 14.7 m/s². But, as the car stops it has negative acceleration that is, a = -14.7 m/s².

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