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2-d projectile motion

Vastor
in Classical Physics

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at 6:17, the equation should be

[math]\Delta v = v_f - v_i[/math]

but the vid shown that it substitute [math] v_y [/math] into the equation

[math]\Delta v = v_f - v_y[/math]

which would result in

[math]\Delta v = v_f - \frac{1}{2}v_i[/math]

does I miss something here? or Khan just do another mistake?

Edited by Vastor

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