A ball moves downward to the ground from point X. Point X is $2.4\text{ m}$ above the ground. After rebounding from the ground, the ball rises to point Y. Point Y is $1.8\text{ m}$ above the ground. To find the change in gravitational potential energy of the ball from X to Y, one value of the change in height $\Delta h$ is used. What is the size of $\Delta h$?
- A$0.6\text{ m}$
- B$1.8\text{ m}$
- C$2.4\text{ m}$
- D$4.2\text{ m}$