Lemma
EasyCurves in space
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §12.2 Plane Motion: Projectiles and Cycloids, #16 · Multivariable Calculus · Curves in space

At what point on the path is the speed of the projectile…

At what point on the path is the speed of the projectile (a) least
(b) greatest?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §12.2 Plane Motion: Projectiles and Cycloids, #16

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