In the air, it had an average speed of 16m/s. In the water, it had an average speed of 3m/s before hitting the seabed. The total distance from the top of the cliff to the seabed is 127 meters, and the stone's entire fall took 12 seconds
+37153 16 (x) + 3 (12-x) = 127 x = air time 12- x = sea time
x = 7 seconds height = 16 m/s * 7 s = 112 meters
sea time = 5 depth = 3 m/s * 5 s = 15 meters
