Question

----------------- describes how fast something is going, whereas, ---------- describes how fast something is going in a certain direction

• A. Speed
• B. Velocity

Answer 1

Speed

1. The rate of change of position of an object in any direction is known as speed.
2. We can calculate the speed as the ratio of distance to the time covered by the object.
3. Speed is a scalar quantity as it only has direction and no magnitude.
4. SI unit of speed is $m{s}^{-1}$ (meter per second).
5. $Speed=\frac{dis\tan ce}{time}$

Velocity

1. We can determine velocity by the rate of change of displacement of the object with respect to a reference frame and time.
2. Velocity is a vector quantity as it has both magnitudes as well as direction.
3. Si unit of velocity is $m{s}^{-1}$ (meter per second).

Hence. speed describes how fast something is going, whereas, velocity describes how fast something is going in a certain direction