Acceleration (magnitude anyway) = (change in speed) / (time for the change) .
Change in speed = (10 - 30) = -20 m/s
Time for the change = 4.0sec
Magnitude of acceleration = -20/4 = <em>-5 m/s² </em>
Choices A, B, and D are false statements.
I think choice-C is trying to say the right thing, but it
might have gotten copied incorrectly.
Electric fields and electric forces both increase as the distance
decreases, and decrease as the distance increases.
Answer:
Explanation:
From the question we are told that:
Electric Field strength 
Potential difference is 
Generally the equation for distance is mathematically given by
The two correct statement are A and B. Light waves are electromagnetic waves that can travel through a vacuum. Mechanical waves can travel through a vacuum.
<h3>What is an electromagnetic wave?</h3>
EM waves are the electromagnetic radiations are made up of electromagnetic waves created when an electric field collides with a magnetic field.
Electromagnetic waves may alternatively be defined as the combination of oscillating electric and magnetic fields.
Electrically charged particles experiencing acceleration create electromagnetic waves, which can then interact with other charged particles and exert force on them.
The two correct statement is;
1. Light waves are electromagnetic waves that can travel through a vacuum.
2. Mechanical waves can travel through a vacuum.
Hence,two correct statement are A and B.
To learn more about the electromagnetic wave refer to the link;
brainly.com/question/8553652
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