Yes, it is indeed possible to have negative velocity. Velocity is a vector quantity that represents both the magnitude (speed) and the direction of motion. The negative sign in velocity indicates motion in the opposite direction of a chosen reference point or positive direction.
Consider a scenario where an object is moving along a straight line. If the object moves to the left, opposite to the chosen positive direction, its velocity will be assigned a negative value. This indicates that the object's motion is in the opposite direction of the reference point or the positive direction chosen.
For example, if a car is moving in the positive direction of a road with a velocity of +20 m/s, and then it starts moving in the opposite direction (left) with a velocity of -20 m/s, the negative velocity indicates that the car is now moving in the opposite direction of the positive direction initially chosen.
In summary, negative velocity represents motion in the opposite direction of a chosen reference point or positive direction. It is a valid concept and often occurs in situations where an object moves in the opposite direction of the positive direction chosen for measurement or analysis.