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Projectile Motion Launched From Above Ground

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BakerDad12:
Hi guys, on the topic of the position of a projectile, Physics In Focus says: Sx = x0 + uxt and Sy = y = uyt +1/2ayt2.

What do the x0 and y 0 mean? I am struggling to understand this.

Thank you so much for your time guys!!

DrDusk:

--- Quote from: BakerDad12 on November 03, 2019, 06:58:28 pm ---Hi guys, on the topic of the position of a projectile, Physics In Focus says: Sx = x0 + uxt and Sy = y = uyt +1/2ayt2.

What do the x0 and y 0 mean? I am struggling to understand this.

Thank you so much for your time guys!!

--- End quote ---
Well firstly I don't see any y0, and the x0 is what horizontal distance the projectile starts from with reference to your origin. For example in the x-y plane if you take (0,0) as the place of where displacement is measured and your projectile is launched from (1,0). Then it's total displacement from the reference point is 1 + uxt where '1' is  x0. Of course this would be different if say you were measuring from (2,0), then it would be (2)+uxt where (2) is  x0.

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