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At some point it should be pointed out that there is nothing unique about the terrestrially observed turn-around point of an upward tossed projectile. It is, in fact, a frame dependent phenomenon. In another inertial frame (eg., rising helicopter) there may not even be a turn-around point, and the observed acceleration is the same.
Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
treborsci@verizon.net
http://mysite.verizon.net/res12merh/
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