Question

The velocity of a body is continuously changing. Can its speed remain constant? If speed is changing, can the velocity remain constant?

Answer 1

Velocity is vector. Speed is scalar.

What I mean by that is velocity has two components: magnitude (numerical value) and direction. On the other hand, speed only has magnitude.

So to change velocity, you have to change at least one of direction or magnitude. 20 m/s south isn’t the same as 20 m/s north. And when we consider speed, magnitude is all that matters. To change it, you only need to focus on the value itself. 20 m/s south is the same as 20 m/s north - when we consider speed.

A common notion is using +/- sign when we describe velocity. But that doesn’t imply when we consider speed.

No velocity will never remains constant...

Hope this will help you...... ✌

Answer 2

Answer:

The speed must remain constant in order to maintain a constant velocity. A body can maintain a steady speed while changing directions (velocity). Rather, it can have a constant speed and a variable velocity. For instance, in a circular motion.