If a body crashes into a water surface at high speed, the impact is almost as hard as on a solid surface. Explain why. I think it is something like this: The water cannot displace fast enough and so all the molecules are close together as if they were a solid. Also: The Earth rotates at over 1000km/h so why when you jump off should the wall not slam into you? I think it is that the entire Earth (even until the edges of its magnetic field rotate at that speed, and so it does not matter if you are on the ground or in the air because the entire system is moving. Thank you for your input in advance.