Solve the Problem $$s ( t ) = - 16 t ^ { 2 } + 112 t + 4$$

question 101

Multiple Choice

Solve the problem.
-A foul tip of a baseball is hit straight upward from a height of 4 feet with an initial velocity of 112 feet per second. The function $$s ( t ) = - 16 t ^ { 2 } + 112 t + 4$$ 4 describes the ball's height above the ground, s(t) , in feet, t seconds
After it was hit. What is the instantaneous speed of the ball 0.5 seconds after it was hit?

• A) -28.8
• B) 96
• C) -67.2
• D) 28.8

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