According to Coulomb's law, the force of interaction between any two charges is inversely proportional to the product of charges and directly proportional to the square of the distance between them.​

any one of the statements could be an accurate comparison. but the statement that would define the correct choice and seal the deal is not even on the list:

"the visibilities of vector-x and vector-y in the drawing provided with the question are identical and nonexistent."

where is the circuit diagram ?

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray