Three protons Element? Mass? Period? Family?

a

explanation:

because they are cartillidge

i wanna say it’s between b and d, leaning more towards b.

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.