How to use Unit Vectors for Position, Velocity and Acceleration

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How to write position, velocity and acceleration vectors in unit vector notation (i and j) and how to solve parametric equations to graph y vs x for two dimensional motion.

Edit: Velocity is always TANGENET to the path, not perpendicular. Sorry!
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At 17:28 I meant to say velocity is always TANGENT to the path. Not perpendicular. Sorry!

HowToPhysics
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this is exactly what I've been looking for.Thank you sir!

Notra_bel
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At 13:30 you use m/s2 as your unit after solving for velocity

elanimrozek
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At 21:24 why do you use the angle of the position rather than the angle for the velocity?

sanaokumura-craddock