Define the terms pitch and count​

Pitch: the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone.

count: determine the total number of (a collection of items).

Explanation:

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this