Positive charge=proton
Negative charge=electron
No charge/neutral=neutron
Answer:
B - Velocity
Explanation:
Velocity definition: “The speed of something in a given direction.”
The frequency of a simple harmonic oscillator such as a spring-mass system is given by

where
k is the spring constant
m is the mass attached to the spring.
Re-arranging the formula, we get:

and since we know the constant of the spring:

and the frequency of oscillation:
f=1.00 Hz
we can find the value of the mass attached to it: