a=d^2x/dt^2
呢條式係咩黎,我響神探伽俐略到睇出黎

冇睇錯的話呢條係differential equation,微分方程

唔係喎,應該係關力學事,因為佢個集係講緊力學

Displacement = x
Velocity v = dx/dt
Acceleration a = dv/dt = d^2x/dt^2

咁d係咩?distance?
dv/dt係acceleration咩= =?

無人識-_-????

有無人回下我-_-

讀完Additional Maths就會識...d指delta
http://en.wikipedia.org/wiki/Differential

另外, 中六讀既Applied Maths, 就會用微積分黎計力學既數

dv/dt係acceleration啊