Acceleration

Accerelation is the rate of change in velocity. Simpler terms: How quickly something speeds up or slows down
Acceleration is m/s²
Time (s)
velocity=m/s

acceleration=change in velocity/time
If “u” is a formula, simply means initial velocity

If it took a car 5s to accelerate from 15m/s to 35m/s
15 would be the initial velocity, 35 would be the final velocity
Change in velocity= 35-15=20
20/5 = 4m/s²

Acceleration is a vector quantity therofre can be negative (decelerating)

The 4m/s² is the average acceleration within those 5s
If the car had accelerated at the same rate the entire time, it is called uniform/ constant acceleration

If you are given distance, you use the equation:
2as=v²-u²
s=distance
v²=final velocity
u²= initial velocity
If you are given time: you’d use this equation:
A= change in v divide by time

where v stands for change in velocity

Imagine a ball is dropped from a height above the ground. The speed of the ball is 7m/s. Calculate the height from which the ball was dropped, ignoring air resistance
v=7m/s
u= 0m/s
a=9.8m/s²

Re arrange 2as=v²-u² into s=v²-u²/a
Plug in the numbers
2.5m