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Old 01-30-2013, 05:26 AM   #8
Join Date: Dec 2012
Posts: 1,294

the other way to describe this -

since the swing is a circular motion, not linear, so the initial acceleration direction is not the impact direction.

think about hammering a nail into a wall, you do accelerate UP initially.....

but you accelerate forward only if you hammer one into the floor
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