If a ball is thrown straight up, what is true about its state at the very apex of its flight?
Answer
It has an instantaneous velocity of zero but a non-zero acceleration
At the apex, the ball momentarily stops ($ ext{velocity} = 0 ext{ m/s}$), but gravity imposes a constant downward acceleration ($ ext{acceleration} = -9.8 ext{ m/s}^2$) which immediately causes it to move downward.
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