Brilliant! Motion is always relative. Whenever you say that an object is moving, you must also mention with respect to (

**wrt**) what.When we say that a car is moving at \(30 \, \mathrm{km/h}\), we mean that it is moving at \(30 \, \mathrm{km/h}\) wrt

Look at this animation. In one case, two cars are moving at \(30 \, \mathrm{km/h}\) and \(40 \, \mathrm{km/h}\) in the

**the Earth**.Look at this animation. In one case, two cars are moving at \(30 \, \mathrm{km/h}\) and \(40 \, \mathrm{km/h}\) in the

**same direction**. In another case, the cars are moving with the same speed in**opposite directions**.In what case is the car accident more damaging?

- Case A
- Case B
- Both cases are equally damaging