derivation using command diff

if x is position and t time

velocity=diff(x)./(diff(t)

acceleration=diff(x,2)./diff(t,2) or diff(x,2)./diff(t)

?

can anyone confirm?

[Daniel Shub]

This is a doit4me question.

Answer 1

[John Petersen]

velocity = diff(x);
acceleration = diff(velocity);

You can verify it yourself with an example such as x=cos(t), v=sin(t), a=-cos(t)