Solve the Problem $$s ( t ) = - 16 t ^ { 2 } + 112 t + 128$$

question 174

Multiple Choice

Solve the problem.
-An object is propelled vertically upward from the top of a 128-foot building. The quadratic function models the ball's height above the ground, s(t) , in feet, t seconds after it was thrown. $$s ( t ) = - 16 t ^ { 2 } + 112 t + 128$$ How many seconds does it take until the object finally hits the ground? Round to the nearest tenth of a second if
Necessary.

• A) 2 seconds
• B) 1.0 seconds
• C) 3.5 seconds
• D) 8.0 seconds

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