A ball is projected horizontally from the top of a building. One second later, another ball is projected horizontally from the same point with the same velocity. (a) At what point in the motion will the balls be closest to each other? one second after the second ball is projectedthe instant the second ball is projected    the instant the first ball hits the groundThey stay equidistant from each other throughout the motion. (b) Will the first ball always be traveling faster than the second? YesNo     (c) What will be the time difference between them when the balls hit the ground? between one and ten secondsno time difference    one secondIt depends on the height of the building. (d) Can the horizontal projection velocity of the second ball be changed so that the balls arrive at the ground at the same time? YesNo

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Projectile Motion