A body moves at a speed of `100 ms^(-1)` for `10 s` and then moves at a speed of `200 m s^(-1)` for `20 s` along the same direction. The average speed is …………………………….,

Explanation

`v_(av)=(s)/(t) =(100xx10+200xx20)/(10+20) =(500)/(3) m s^(-1)`.