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A water balloon was dropped from a high window and struck its target 1.1 seconds later. If the balloon left the person's hand at -5.0 m/sec, what was its velocity on impact?
The acceleration of gravity on Earth is 9.8 meters per second every second. So in 1.1 second of falling, an object gains (9.8 x 1.1) = 10.78 meters per second of downward speed.
The balloon was already falling at 5 m/sec when the time began, and it gained another 10.78 m/sec on the way. So at the end of 1.1 second, its downward speed was (5.0 + 10.78) = 15.78 m/sec.
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