Posted by Anonymous on Sunday, April 17, 2011 at 7:33pm.
If you were standing in the back of a truck moving at 70 mph, and you threw a baseball in the opposite direction at the same speed, would it just fall straight down?

math  bobpursley, Sunday, April 17, 2011 at 7:38pm
Yes, depending on how the "speed" was measured. If the speed is relative to the truck, then yes, it falls straight down relative to a ground observer.
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