Two students each launch a ball horizontally from the top of a tower, and both balls are released at the same instant. The first student sends her ball at a speed of $20\,\text{m s}^{-1}$, while the second student sends his ball at a speed of $10\,\text{m s}^{-1}$. Take air resistance as negligible and assume that the balls strike level ground. Which row gives the horizontal distances covered and the times taken to land for the two balls on the ground?
- Ahorizontal distances: same; landing times: same
- Bhorizontal distances: same; landing times: different
- Chorizontal distances: different; landing times: same
- Dhorizontal distances: different; landing times: different