State the quantity, aside from $t$, that must be measured if you want the average speed.
State the quantity, aside from $t$, that must be measured if you want the average velocity.
Define acceleration in words.
State the quantity, aside from $t$, that needs measuring to determine the average speed.
State the quantity, aside from $t$, that needs measuring to determine the average velocity.
For the girl's motion, calculate the distance fallen from time $t = 0$ to the moment she lands on the trampoline.
For the girl's motion, calculate the average acceleration while she rebounds.
Use Fig. 2.3 to compare, without calculation, the girl's acceleration before and after the rebound. Explain your reasoning.
Use Fig. 2.3 to compare, without calculation, the girl's potential energy at $t = 0$ and $t = 1.85\text{ s}$. Explain your answer.