Find after how long will the balls be at the same height

Reference no: EM13699633

Question: A ball is thrown upward from the ground with an initial speed of 20.2 m/s; at the same instant, another ball is dropped from a building 10 m high.

Part A: After how long will the balls be at the same height?

I know the correct answer but explain how to get this answer!

Reference no: EM13699633

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