The ball is accelerating
Explanation:
On a distance-time graph, the slope of the graph represents the speed of the object represented.
Let's therefore calculate the slope (so, the speed of the ball) in the two intervals given.
In the first second, we have:

So the average speed is

In the next second, we have:

So the average speed is

We notice that the speed of the ball has increased from 20 m/s in the first second to 40 m/s in the next second: this means that the speed of the ball is increasing, and therefore, the ball is accelerating.
Learn more about acceleration:
brainly.com/question/9527152
brainly.com/question/11181826
brainly.com/question/2506873
brainly.com/question/2562700
#LearnwithBrainly
The property that describes an electromagnetic wave and not a mechanical wave is travels in a a vacuum. That will make the correct answer B. I hope that helps you.
Frequency = speed ÷ wavelength
= 330m/s ÷ 2.5m
= 132 Hz
A scientific law is absolute, it cannot be proven wrong. A scientific theory is like a belief, it has been proven but can also be argued or disproven.