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::It was not until the Renaissance that anyone did enough experimentation and observation to discover that falling objects pick up speed with each passing second. A cannonball which falls for 3 seconds will hit the ground at 90 feet/second (but you'd have to drop it from 140 feet for it to have that much time to fall). But a cannonball which falls for only 2 seconds will hit the ground at 60 feet/second after falling 65 feet. And a cannonball dropped from a height of 16 feet will hit the ground at 32 feet/second. You can drop a 5-pound, 8-pound and 10-pound cannonball together, and they'll hit the ground at almost exactly the same time. You'll hear a badadum sound as they hit within a fraction of a second. --[[User:Ed Poor|Ed Poor]] 16:26, 10 May 2007 (EDT)
::It was not until the Renaissance that anyone did enough experimentation and observation to discover that falling objects pick up speed with each passing second. A cannonball which falls for 3 seconds will hit the ground at 90 feet/second (but you'd have to drop it from 140 feet for it to have that much time to fall). But a cannonball which falls for only 2 seconds will hit the ground at 60 feet/second after falling 65 feet. And a cannonball dropped from a height of 16 feet will hit the ground at 32 feet/second. You can drop a 5-pound, 8-pound and 10-pound cannonball together, and they'll hit the ground at almost exactly the same time. You'll hear a badadum sound as they hit within a fraction of a second. --[[User:Ed Poor|Ed Poor]] 16:26, 10 May 2007 (EDT)
:::I once saw a demonstration in a museum of a feather and a rock being dropped simultaneously down a big evacuated cylinder that must have been about twenty feet high. Very impressive.
:::Of course, there's another way to demonstrate this, which is to take a fairly large, heavy book; hold it horizontally; place a feather on top of it; and drop the book, flat. The feather stays with the book. I didn't believe this until I tried it myself. [[User:Dpbsmith|Dpbsmith]] 16:38, 10 May 2007 (EDT)