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A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally away from and below the point of release. What is the speed of the ball just before it strikes the ground?
A. 43m/s.
B. 49m/s.
C. 39m/s.
D. 36m/s.
E. 14m/s.
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