Physical Science Use the height formula in Example 10 to work the given problem. Note that an object that is dropped (rather than thrown downward) has initial velocity v0 = 0.
A ball is thrown upward from ground level with an initial velocity of 64 ft per second. In how many seconds will the ball reach the given height?
(a) 64 ft
(b) 39 ft
(c) Why are two answers possible in part (b)?
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