Assume that a person pouncing a ball represents a closed system. Which statement best describes how the amounts of the ball's potential and kinetic
energy change?
A. Both the kinetic and potential energy of the ball increase.
B. The ball's kinetic energy increases as it falls and its potential
energy decreases.
C. Both the kinetic and potential energy of the ball decrease.
D. The ball's potential energy decreases as it rises and its kinetic
energy increases.

Plz mark brainliest 30 points1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s.2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Ineed to find the answer of this question because i dont understand it