To find: The time interval when the ball is at least 32ft height.
The time interval is .
The formula for obtaining height is, .
Since the height of the ball should be 32 ft minimum, .
Thus, the equation becomes,
Find the roots of the above equation, .
The roots are . Thus, time interval is, .
Since time cannot be negative, the interval of time when the ball is at minimum 2 ft is .
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