When you fall from that height you will reach a terminal velocity of little over 210 mph (if falling in the most aerodynamic posture). Assuming the crator Kaido created was about 5 meters deep, and also guesstimating his mass at 500kg, then Kaido hit the ground with a force of around 2 million newtons or around 200,000kg. Whilst this seems a lot, it isn't really much compared to Garp's punches which can crush mountains or the feats of other characters such as Jozu (with the huge piece of ice), Luffy's king kong gun destroying most of Dressrosa, Whitebeard stopping a moving ship with one arm without being pushed back etc.