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 240 ft and​ (b) return to the ground when v0=128 feet per second. (a) Find the​ time(s) that the projectile will reach a height of 240 ft when v0=128 feet per second.

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Projectile Motion