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Question

How can we convert an equation of motion into free fall?

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Solution

The equation of motion are valid for a body undergoing uniform acceleration, a.
v=u+at
s=ut+12at2
v2=u2+2as
During free fall, a body has constant acceleration of g.
Taking vertically downward as positive, the equations will become:
v=u+gt
h=ut+12gt2
v2=u2+2gh

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