Gravity Brothers

Classical Mechanics Level pending

Two brothers, known as the Gravity Brothers, hold a Youtube channel, showing what they did with gravity. One particular video shows them throwing an iPhone up in the air at 400 feet per second. The brother who throws it is throwing it to his brother on a podium 1600 feet above sea level. At first, the brother misses it, but on the way down, the brother catches the device, along with a voided warranty. How many seconds did it take for the 2nd brother on the podium to catch the iPhone?

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Use the appropriate formula for each measurement system. In this case, use the feet formula.

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