The first equation of motion is:

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A v = u + at
B v = u - at
C s = ut + (1/2)at^2
D v^2 = u^2 - at

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Answer: A. v = u + at

The first equation of motion links final velocity v, initial velocity u, acceleration a and time t: v = u + at. It comes from a = (v - u) / t. The equation s = ut + (1/2)at^2 is the second equation, for displacement.

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The first equation of motion is:

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