Use the Position Equation $s = - 16 t ^ { 2 } + v _ { 0 } t + s _ { 0 }$

question 380

Multiple Choice

Use the position equation $s = - 16 t ^ { 2 } + v _ { 0 } t + s _ { 0 }$ , where s represents the height of an object (in feet) , $v _ { 0 }$ represents the initial velocity of the object (in feet per second) , $s_0$ represents the initial height of the object (in feet) , and t represents the time (in seconds) . A projectile is fired straight upward from ground level $\left( s _ { 0 } = 0 \right)$ with an initial velocity of 160 feet per second.At what instant will it be back at ground level?

• A) \(t = 8\) Sec
• B) \(t = 10\) Sec
• C) \(t = 12\) Sec
• D) \(t = 11\) Sec
• E) \(t = 9\) Sec

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