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3.42 seconds

Step-by-step explanation:

Since the time taken by the ball to reach its maximum height depends on the initial vertical speed only so the height from which it is launched makes no  difference.

We know that,

the  acceleration of gravity = 32.2 ft/s²

so every second, the ball will lose 32.2 ft/s of its  upward speed and ultimately stop rising when its vertical  speed has reached to zero.

So the ball will attain its maximum height in 3.42 seconds after the launch.

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step-by-step explanation: