Does the phrase "direction of zero vector" have physical significance? Discuss in terms of velocity, force etc.

The direction of the angular velocity vector is along

The direction of the angular velocity vector is along

Unit vector does not have any

Velocity does not change when direction changes.

What kind of lining does trachea have ? Does it have any significance?

Assertion : Acceleration of a moving particle can change its direction without any change in direction of velocity. Reason : If the direction of change in velocity vector changes, the direction of acceleration vector also changes.

Assertion : Acceleration of a moving particle can change its direction without any change in direction of velocity. Reason : If the direction of change in velocity vector changes, the direction of acceleration vector also changes.

Assertion: In projectile motion, the acceleration is constant in both magnitude and direction but the velocity changes in both magnitude and direction. Reason: When a force or accelration is acting in an oblique direction to the direction of velocity then both magnitude and direction of the velocity may be changed.

A charged is moving with constant velocity parallel to a horizontal current carrying long wire. The direction of velocity of that particle and the current are same. If the force acting on the particle are only magnetic force due to wire and gravitational force due to earth, then the particle :

Write two different vectors having same direction.