that when an object is acted on by a force,it is caused to accelerate,and a magnitude of the acceleration is directly proportional to the size of the thus acceleration enters into the basic laws of motion in an essential wny
If f'(x) is a ferentiable function of x,its derivative is called the second derivative with respect to x. if the second derivative is a differentiable function of derivative is called the third derivative of y,and so on.