Displacement is the distance something is from it's starting position (the distance it has been displaced).
Instantaneous speed is the speed at an instant point - e.g. the speed at a certain point in time
Average speed is the total distance divided by the time taken
Velocity is the change in displacement divided by the time taken
Acceleration is the change in velocity divided by the time taken
We need to be able to draw displacement, speed, velocity, and acceleration graphs. Don't worry, we did all of that in GCSE lol. Refresh your mind here.
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