Solve the Problem $s ( t ) = - 16 t ^ { 2 } + 128 t + 240$

question 338

Multiple Choice

Solve the problem.
-An object is propelled vertically upward from the top of a 240 -foot building. The quadratic function $s ( t ) = - 16 t ^ { 2 } + 128 t + 240$ models the ball's height above the ground, $s ( t )$ , in feet, $t$ seconds after it was thrown. How many seconds does it take until the object finally hits the ground? Round to the nearest tenth of a second if necessary.

• A) \(9.6\) seconds
• B) \(1.6\) seconds
• C) 4 seconds
• D) 2 seconds

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