Acceleration
Definition: The rate at which velocity changes with time.
Equation: Acceleration = Final Velocity - Starting Velocity/Total Time
Math Solution: As a roller-coaster car starts down a slope, its velocity is 6 m/s. But 2 seconds later, its velocity is 15 m/s in the same direction. What is its acceleration?
Answer: 15m/s - 6m/s = 9m/s/2s = 4.5m/s²