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範例:自由落體與等加速度運動

某自由落體,路經途中A點時的速率為著地末速的一半,且由A點到著地費時3秒,則此落體:(1)全程歷時幾秒?(2)最初離地的高度H有多高?(重力加速度g=9.8 m/s2)
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