"Sit back in your chair honey, quit tryin' to climb out (wa'!)
I told you it's okay hai hai, want to ba-ba?
Take a night-night? nan-a-boo, goo-goo ga-ga?
Her make goo-goo ca-ca? da-da change your dia-dee.
Clean the baby up so her can take a nighty-nighty.
Your dad'll wake her up as soon as we get to the water.
Ninety-seven bonnie and clyde, me and my daughter."

Marshall 和 Hailie 一起去湖邊玩，兩個人一起往湖裡丟東西

東西在沉入水中時只受到三個力，重力、浮力和水的阻力

假設重力和浮力造成的向下加速度固定是 $A$

水的阻力造成的向上加速度為 $k{v}^2$ ( $v$ 代表當前速度 )

那總體來說的向下加速度就是 $A-k{v}^2$

請你求出在初速為 $0$ 的狀況下，過了 $t$ 單位時間，這個物體的位移、速度和加速度

(假設都沒碰到湖底)