The acceleration of free fall is the acceleration due to gravityg = 9.81ms-2 near the Earth's surface.You can use the constant acceleration formulae with g since it is considered constant near the Earth's surface.When throwing an object upwards, g=-9.81ms-2.When an object falls its acceleration g is 9.81ms-2
Acceleration Due to Gravity
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Specification: AQA Physics (7407), AS-level, 3.4.1.3 Motion along a straight line. Topic: Motion.