You are standing at the top of a cli? that has a stairstep con?guration. There i

Question

You are standing at the top of a cli? that has a stairstep con?guration. There is a vertical drop of 3 m at your feet, then a horizontal shelf of 5 m , then another drop of 7 m to the bottom of the canyon, which has a horizontal ?oor. You kick a 0.12 kg rock, giving it an initial horizontal velocity that barely clears the shelf below.What initial horizontal velocity v will be required to barely clear the edge of the shelf below you? The acceleration of gravity is 9.8 m/s2. Consider air friction to be negligible.
Answer in units of m/s

Explanation / Answer

v(x) x t =5 h =0.5x9.8 xt^2 = 3 t = 0.78246 sec v(x) = 5/t =6.39 m/s

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