What can be the angle between velocity and acceleration for the motion on a straight line? Explain with an example.

(N/A) For motion in a straight line,the angle between velocity and acceleration can only be $0^{\circ}$ or $180^{\circ}$.
$1$. If the angle is $0^{\circ}$,the velocity and acceleration are in the same direction,which means the speed of the object increases (accelerated motion).
Example: $A$ car starting from rest and speeding up in a straight path.
$2$. If the angle is $180^{\circ}$,the velocity and acceleration are in opposite directions,which means the speed of the object decreases (retarded motion).
Example: $A$ car applying brakes while moving in a straight line.