ADumbHumanBeing ADumbHumanBeing 16-12-2021 Physics contestada A rock falls off a cliff and hits the ground after three seconds. The rock's velocity is 29.4 m/s when it hits the ground. What is its acceleration of the rock in the downward direction? A. 0.31 m/s2 B. 3 m/s2 C. 9.8 m/s2 D. 88.2 m/s2