If you're talking about velocity, it would change drastically upon hitting the ground. Because it is a vector quantity, the number would be it's negative since the object moves backwards..
However, if you're talking about speed, the number would not change much upon hitting the ground. If drawn on graph, it would look like a wave that steeps down everytime it hits the maximum point and have the same minimum point; zero, a wave which gradually gets smaller over time.
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they depend on how fast it cools down
they use magnets so it doesn't hit the ground
Something done is a fast way, expodited.
Falling off tubes in water can happen due to factors like losing balance, hitting a wave or wake at an awkward angle, or shifting your weight suddenly. It can also be caused by going too fast, hitting an obstacle, or not properly gripping the handles.
Depends on where you are and how strong the earthquake is. If you are inside and the earthquake is a 5 or 6 everything shakes and moves around you. If it is a rolling earthquake the ground seems to roll, but if it is shifting it goes up and down. Things like plants swing, pool water splashes out of the pool, books move, and things fall to the floor. In a car, if it is moving, you don't feel it. If stopped the car shakes a bit. Things happen pretty fast in an earthquake and it isn't like watching one in a movie. The thing to be careful of something hitting you on the head or a building falling in around you. Get under a table or in a doorway when it is going on and then go outside to a area way from buildings when it is done.