A ball is dropped from rest at the top of a 100 m tall building. At the same instant, a second ball is thrown upward from the base of the building with an initial velocity of 50 m/s. When will the two balls collide, and at what distance above the street?
The law of motion of the first ball
The law of motion of the second ball
At the instant when balls collide so
The distance above the street
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