Velocity-time graph for the motion of an object in a straight path is a straight line parallel to the time axis.
$(a)$ Identify the nature of motion of the body.
$(b)$ Find the acceleration of the body.
$(c)$ Draw the shape of distance-time graph for this type of motion.

(N/A) If the velocity-time graph is a straight line parallel to the time axis,the object moves with a constant velocity and the motion is uniform.
$(b)$ Since velocity is constant,the change in velocity is zero. Therefore,acceleration,which is the rate of change of velocity,is zero.
$(c)$ For uniform motion,the distance-time graph is a straight line passing through the origin,as shown in the image.