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[Phys-l] Laws of motion with constant acceleration (was projectile motion)



Bernard Cleyet wrote.....
Curious I thought there was only one -- from which all others (simple ones not requiring Hamilton's principle, etc.) are derived.

I thought there were 2 (How can you derive anything from just 1?)

The definition of acceleration
a = (V - Vo)/t

and that distance traveled = average velocity × time
i.e. (x - xo) = {(V + Vo)/2}× t noting average velocity is equal to the average of the initial and final velocities if the acceleration is constant,

cheers,
David

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