किसी गतिशील वस्तु के लिये किसी क्षण पर

$(A)$ Suppose throwing a ball vertically up. At the highest point. It is at momentary rest $( V = O )$ i but acceleration $g$ still acts downwards. So, (A) is incorrect.

$(B)$ A slowing body has positive retardation.

$(C)$ Distance travelled is always positive, irrespective its motion.

$(D)$ From second law of kinematics,

$x=x_0+u t+\frac{1}{2} a^2$

By knowing $u , a$ and $x _0$ at instant $t =0$ we can determine $x$ at any $t$.