Originally Posted by
boomerman
I like the fact that he says they can just estimate the speed and it would hold up in court..
I think I would take a book into court and drop it from 5' in the air and ask the officer to guess the speed of it as it is falling.
I bet he can not even get close to the speed.
What are you saying? Completely obvious what the speed is. 9 4/5 metres per second per second is the acceleration, of objects falling on Earth in a vacuum (it does go down slightly as you increase altitude, but this is only important when you are going on the Moon or somethign) and a book dropping in the atmosphere of a courtroom should accelerate at a predictable 9.8m/s^2 (reasonably close) every time.
Two metres (6 2/3 feet) from the ground, when it hits the ground it should be travelling at about 6 1/4 m/s, which is 22 1/2 km/h or about 13 4/5 miles per hour. (sorry I think in metric...).
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