Physics
Physics, 13.11.2020 18:50, caro11377oxq5d0

A student drops a pebble from the edge of a vertical cliff. The pebble hits the ground 4 s after it was dropped. What is the velocity of the pebble just before it hits the ground? A. 20 m/s
B. 40 m/s
C. 60 m/s
D. 80 m/s

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