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A) A ball is released from the top of a 67.0 m high building. At the...

A) A ball is released from the top of a 67.0 m high building. At the same instant a second ball is shot straight up from the ground with an initial speed of 20.0 m/s , directly below the point where the first ball was dropped. Ignore air drag and calculate the height above the ground where the balls collide. the velocity (magnitude and direction) of each ball just before the collision.

B) Three vectors A, B, and C each has a magnitude of 40.0units. Their directions relative to the positive x axis are 30.0?, 90.0?, and 120?, respectively. Using analytical methods, calculate the magnitude and direction of the following combinations,

i) A+B?C.

ii) 2(A+C)?3B.

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