It is called deceleration or slowing down.
Velocity being a vector, it is tricky to say that "velocity increases or decreases". Its magnitude might decrease - but its magnitude is, precisely, the speed.
Velocity is a vector , which it means it has both magnitude and direction. Scalars have only magnitude. The magnitude of a velocity vector is usually called speed . Although I have never heard it called by that name, scalar velocity is speed.
It is called acceleration.
It is called acceleration.
It is called acceleration.
It is called deceleration or slowing down.
Velocity being a vector, it is tricky to say that "velocity increases or decreases". Its magnitude might decrease - but its magnitude is, precisely, the speed.
Velocity is a vector , which it means it has both magnitude and direction. Scalars have only magnitude. The magnitude of a velocity vector is usually called speed . Although I have never heard it called by that name, scalar velocity is speed.
It is called acceleration.
It is called acceleration.
It is called acceleration.
It is called acceleration.
It is called acceleration.
what is magnitude of average velocity
The increase in velocity is called acceleration and an decrease is called deceleration.
Any change of velocity, including a decrease of speed, is described and measured as acceleration. Assuming the velocity and acceleration vectors point in the same direction, then in the case of decreasing speed, the magnitude of the acceleration is a negative value. Negative acceleration is often called deceleration, but that is just a special case of acceleration.
Velocity has a DIRECTION as well as a MAGNITUDE (that is, velocity is a VECTOR quantity if you've learnt that term yet) The magnitude of velocity is called SPEED (just a POSITIVE number/scalar, not a vector)