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A projectile is launched from ground level with an initial velocity of v0 feet per second. Neglecting air resistance, its height in feet t seconds

A projectile is launched from ground level with an initial velocity of v0 feet per second. Neglecting air resistance, its height in feet t seconds after launch is given by s=16t2+v0t.Find the time(s) that the projectile will (a) reach a height of 320 ft and (b) return to the ground when v0 is 128 feet per second.

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