A body travels from A to B at `40 ms ^(-1),` and from B to A `60 ms ^(-1)` Calculate average speed.

Explanation

We are given : `v _(AB) = 40 ms ^(-1) , v _(BA) = 60 ms ^(-1)`
Using relation , `vec v = ( v_(AB) + v _(BA))/( 2 ) = ( 40 + 60) /(2) = 50 ms ^(-1).`