Question

a body moving with uniform speed may have variable velocity,
explain

Answer 1

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A body moving with uniform speed may have variable velocity because :

• Speed is a scalar quantity which have only magnitude and this quantity doesn't change in respect to direction. whereas;

• Velocity is a vector quantity which has both magnitude and direction and it also changes with the change in direction.

So, In the case of a body moving with uniform speed only represents that the body is in motion and covering equal distances in equal intervals of time. But velocity can be variable because it is not clear that the body is moving along a particular direction or it is changing its direction with time.

So, a body moving with uniform speed may have variable velocity.

Answer 2

Answer:

velocity is given by total displacement by total time i.e the total length the body gets displaced by the total time taken.

speed is given by the total distance traveled by a body by total time taken.

the velocity of a body can vary even is the speed is constant. To understand, we can take the example of uniform circular motion.

In uniform circular motion, the speed of the body remains constant but the velocity keeps changing at every point on the path.

This also happens because,

• Speed is a scalar quantity which means it has magnitude bus does not depend upon the direction in which the bady is moving.
• Velocity is a vecor quantity and has magnitude and depends upon the direction in which the body would be moving.
• when the direction changes, the velocity changes too [ even if the magnitude does not change ] .

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