Question

The plane flight covers 400 miles in the first hour. As you approach the landing site, it takes you an hour to cover the last 200 miles. This is an example of

Answer 1

Answer: Negative acceleration

Explanation:

According to the described situation we have two velocities:

-An initial velocity during the first hour: $V_{o}=400 mi/h$

-A final velocity during the last 200 miles: $V_{f}=200 mi/h$

As we can see, the final velocity is less than the initial velocity, this means the plane's velocity decreased.

On the other hand, acceleration $a$ is defined as the variation of velocity in time:

$a=\frac{\Delta V}{\Delta t}$

$a=\frac{V_{f}-V_{o}}{\Delta t}=\frac{200 mi/h-400 mi/h}{\Delta t}$

$a=\frac{-200 mi/h}{\Delta t}$ Since the plane's velocity decreases, the acceleration is negative.

Hence, this situation is an example of negative acceleration.

Answer 2

Answer:

Negative acceleration

Explanation:

Lets think of this simply. If the first hour the plane covers 400 miles then the next it covers 200 well it didn’t speed up it slowed down so its best to say it was negative acceleration.