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Mathematics, 20.10.2021 16:10 mawawakaiii

A projectile is launched from ground level with an initial velocity of v0 feet per second. Neglecting air resistance, it’s height in feet t seconds after launch is given by s= -16t^2 +v0t. Find the time(s) that the projectile will reach a height of 320 ft and return to the ground when v0 is 128 feet per second

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