Isparkoals7h Isparkoals7h

18-10-2016
Physics

contestada

A Cannon shell is fired straight up from the ground at an initial speed of 225 m/s. after how much time is the shell at a height of 620 m above the ground and moving down.

Respuesta :

18-10-2016

h = vt + gt^2/2
620 = 225t - 4.9t^2

t = 42.974 seconds

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