If a Ball Is Thrown into the Air with a Velocity

question 21

Multiple Choice

If a ball is thrown into the air with a velocity of 80 ft/s, its height in feet after t seconds is given by s(t) = 80t - 16t². It will be at maximum height when its instantaneous velocity is zero. Find its average velocity from the time it is thrown (t = 0) to the time it reaches its maximum height.

• A)50
• B)60
• C)100
• D)80
• E)40
• F)30
• G)48
• H)32

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