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?
1) 43 m/s
2) 47 m/s
3) 39 m/s
4) 36 m/s
5) 14 m/s
Answer: 2