A $30\mathrm{????}\mathrm{????}$ child starts at rest at the top of a water slide that is $4$ meters above the surface of the water.

a$)$ Calculate the gravitational potential energy of the child when they are at the top of the slide.

b$)$ Calculate the speed of the child when they are $2$ meters above the water.

c$)$ If the child is moving at $7\frac{\mathrm{????}}{\mathrm{????}}$ when they reach the surface of the water, how much mechanical energy was transformed into nonmechanical energy $($heat and sound$)?$

Answer rating: 100% (QA)

a To calculate the gravitational potential energy of the child when they are at the top of the slide we can use the formula PE m g h where PE is the g... View the full answer