A car driving at 90 kph brakes and comes to a stop in 3 sec onds. What was its average accelerat

Name: Problem 1, Chapter 15: Pathways to Astronomy
Uploaded: 2023-04-25T09:23:39-08:00
Duration: 2 min 27 s
Channel: Willis James
Description: A car driving at 90 kph brakes and comes to a stop in 3 sec onds. What was its average acceleration during this time in units of meters/second ^2 ?

step 1 hello welcome to this lesson in this lesson we are looking at how far a car went the brick was a

Question

A car driving at $90 \mathrm{kph}$ brakes and comes to a stop in $3 \mathrm{sec}$ onds. What was its average acceleration during this time in units of meters/second $^{2}$ ?

   A car driving at $90 \mathrm{kph}$ brakes and comes to a stop in $3 \mathrm{sec}$ onds. What was its average acceleration during this time in units of meters/second $^{2}$ ?

Pathways to Astronomy

Stephen E. Schneider 2nd Edition

Chapter 15, Problem 1

Instant Answer

Solved by Expert Willis James

04/25/2023

Step 1

We know that 1 kph is equal to (1000/3600) meters per second. So, 90 kph is equal to: 90 * (1000/3600) = 25 meters/second Now, we know the initial speed (25 m/s) and the final speed (0 m/s), as well as the time it took to come to a stop (3 seconds). We can use Show more…

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A car driving at $90 \mathrm{kph}$ brakes and comes to a stop in $3 \mathrm{sec}$ onds. What was its average acceleration during this time in units of meters/second $^{2}$ ?

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Key Concepts

Deceleration

Deceleration is a form of acceleration where the velocity of an object decreases over time. In problems involving braking, deceleration is calculated the same way as acceleration but typically results in a negative value, indicating a reduction in speed.

Velocity Unit Conversion

Converting velocity from kilometers per hour to meters per second is an important step in physics problems to ensure consistent units. This involves using the conversion factors that 1 kilometer equals 1000 meters and 1 hour equals 3600 seconds, which simplifies to multiplying by 5/18.

Average Acceleration

Average acceleration is defined as the change in velocity divided by the time interval over which the change occurs. It is a vector quantity, indicating not only magnitude but also the direction of the acceleration, and it is a fundamental concept in kinematics.

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