I would like to know why this is the correct answer -Three objects are released to the ground while the mass and net force of each is recorded. Air resistance is assumed to be negligible. Which statement is correct about all three objects?

*The ratio of net force to mass is constant across all objects.

The correct answer is the ratio of net force to mass is constant across all objects.

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.

i don't understand. explain it clearly