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A red ball is dropped from rest at a height of 7.20 m. A blue ball...

A red ball is dropped from rest at a height of 7.20 m. A blue ball at a height of 12.0 m is thrown down at the same instant at 7.00 m/s. How long does it take the blue ball to catch up with the red ball? Please show the formula used and show every step that way I can practice a bunch of other problems like this one. Thank you so much! <3

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