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LV超3A名牌購物網
推希拉里落去(你都係想我咁做姐) 由推果下開始計時 直到你聽到'bang'為止
u=0, a=10, t你用秒錶搵到
by s = ut + 1/2at^2, s = 5t^2
finish
neglect air resistance
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