Question

How are speed and velocity different?

Velocity is the scientific name for speed.

Speed is the distance an object travels. Velocity is the time of travel for the object.

Velocity is a measure of both speed and direction.

Speed is measured in miles per hour. Velocity is measured in meters per second.

Answer 1

The velocity of a body is its speed in a given direction.

Answer 2

Velocity is measured in both magnitude and direction (vector quantity) while speed is only measured in magnitude (scalar quantity)

Step-by-step explanation:

We see velocity is measured using displacement and acceleration which is a vector quantity, as we see below;

`{ \rm{ \vec v} = \vec u + \vec at} \\ { \rm{ \vec {v}^(2) = \vec {u}^(2) + 2 \vec as }} \\ { \rm{ \vec s = \vec ut + (1)/(2) \vec a {t}^(2) }}`

But for speed, distance (scalar quantity) is only measured;

`{ \rm{speed = ( d)/(t) }} \\`

The difference between displacement and distance is that;

Displacement: The direction matters, if a body is moving to north for x meters, then displacement is +x meters, if the body turns back to south, the displacement is -x meters. So total displacement is (-x) + (+x) = 0

So, direction matters.

Distance: Direction doesnot matter, if body moves to north x meters, and again reverses to south for x meters, total distance is (x + x) = 2x