The acceleration of gravity on earth is approximately 10 m/s2 (more precisely, 9.8 m/s2). if you drop a rock from a tall building, about how fast will it be falling after 3 seconds? view available hint(s) the acceleration of gravity on earth is approximately 10 m/s2 (more precisely, 9.8 m/s2). if you drop a rock from a tall building, about how fast will it be falling after 3 seconds? 10 m/s2 20 m/s 30 m/s 10 m/s 30 m/s2