Question

When the batter hit the foul ball, the baseball moved upward to a delighted fan in the top deck.

A. KE increases and PE increases.
B> KE increases and PE decreases.
C. KE decreases and PE increases.
D. KE decreases and PE decreases.

Answer 1

We can see here that the correct answer is: A. KE increases and PE increases.

As the ball moves upward against gravity, its height increases, indicating a rise in its potential energy (PE). Since the ball moves, its speed increases, implying an increase in its kinetic energy (KE) as well.

KE (kinetic energy) is the energy possessed by an object due to its motion. When the batter hits the foul ball, the baseball is set in motion, and its kinetic energy increases as it moves upward.

PE (potential energy) is the energy possessed by an object due to its position or condition.

Answer 2

B) Kinetic energy increases, potential energy decreases

Step-by-step explanation:

In a given system, when a body is at rest, v =0m/s, the kinetic energy is at zero while the potential energy is at maximum. However, when a body is in motion with a velocity = v, the potential energy is at zero while the kinetic energy is at maximum.

Before this happen, the a body at rest (P.E = max) is set on motion, the kinetic energy gradually increases till it converts all the potential energy in the system to kinetic energy and then reverses back when the body goes to rest again.

In this case, before the batter hits the ball, the kinetic energy was at zero while the potential energy was at maximum. However, when he hits the ball and sets it into motion with a velocity V, the potential energy converts to kinetic energy and moves the ball with that energy till it has expanded it and comes to rest.

Potential Energy → Kinetic Energy → Potential Energy.

That's how the system keeps changing.