As you read this, how fast are you moving relative to the chair you are sitting on? Relative to the Sun?
Solution 1RQ The relative speed between two object is defined as the rate of change of separation between them. Now while reading the problem, I am sitting on the chair. So the separation between me and my chair is not changing. Hence the relative speed between me and the chair is zero. So I am moving at speed of 0 m/s with relative to the chair. The earth is moving at a speed of 30 m/s with respect to sun. Now since I am on the earth and not moving relative to earth. I am also moving with earth at the same rate. So I am moving at a rate of 30 m/s with respect to sun.