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At t = 0, Ball 1 is dropped from the top of a 19 mm-high building....

At t = 0, Ball 1 is dropped from the top of a 19 mm-high building. At the same instant Ball 2 is thrown straight up from the base of the building with an initial velocity of +12 m/sm/s. Assume that Ball 1 starts from rest and that air friction can be ignored. At what height will the two balls pass each other?

What is the velocity of each ball at the moment they are at the same height? 

Express your answers in meters per second separated by a comma.

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Answer #1

here - sign arises as we take initial velocity of ball 2 in upwards.

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