John's grandfather clock has a pendulum that keeps the seconds. what does this graph say about the observed pattern of motion?

a) the pendulum swings with a constant velocity.

b) the vacillating periodic motion changes sign.

c) the pendulum displays a constant acceleration.

d) the oscilations show a variable rate of motion.

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.