A ball rolls horizontally off a 19.6 m high cliff at 20 m/s (g = 9.8 m/s^2). How far from the base does it land?
Answer and explanation
Correct answer: A. 40 m
- Step 1: Vertical fall: 19.6 = 0.5(9.8)t^2, so t = 2.0 s. Step 2. Horizontal speed is constant: 20 x 2.0 = 40 m. Answer: 40 m. Why not the others: the others use the wrong time or confuse range with height.
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