Quote:
Originally Posted by jwb
That makes sense, I think.
Basically at the peak the ball is already set to move back towards the earth. So even though for an instant it isn't moving it will have a non zero velocity because at any given moment later it will have moved?
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At the peak its
velocity (change in position) is zero because, as you said, it's not moving. Its
acceleration (change in velocity) is nonzero because the velocity is still changing (it's only zero for an instant).
Crash course in calculus.
