One stone is projected horizontally from a 20 m high cliff with an initial speed of 10 ms⁻¹. A second stone is simultaneously dropped from that cliff. Which of the following is true?
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Question

One stone is projected horizontally from a 20 m high cliff with an initial speed of 10 ms⁻¹. A second stone is simultaneously dropped from that cliff. Which of the following is true?

G1 Physics · Accepted Answer

Both stones have the same initial vertical velocity (zero) and the same vertical acceleration g, so they reach the ground at the same time. The horizontally projected stone also has a 10 m/s horizontal component, so its impact speed is greater. Therefore they strike with different speeds, option D.