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When do the 3 equations of constant acceleration apply?

Constant acceleration= velocity changes linearly in velocity time graph, position changes non-linearly in speed time graph

What does Newtowns Law of Gravitation state?

Acceleration due to gravity is constant for all objects despite size i.e. -9.8ms^-2

What does Newtowns Law of Gravitation mean for solving constant acceleration problems?

We always have acceleration(gravity) acting in the y axis

How do you decide which equation to use?

The easiest one with only 1 unknown

Do we solve with both axis in constant acceleration?

No only one axis