Answer:
A rollercoaster speeds up and u r pulled back against your seat. Cus of inertia, we try to stay in the same place. Another one is when we one is when u try to brake a car suddenly and everything in the car gets launched forward cus they were supposed to keep moving.
Translate percentages to letter grades. I know this from personal experience.
Add the time of the different sessions together and once they are all added, that will be your answer.
