1.

A body is travelling between two positions a and b if it travels from a to b with speed v1 and then from b to a in the same path with the speed v2 then the average speed of the total motion is

Answer»

2v1v2v1+v2Explanation:Average speed =TOTAL distance travelled Total TIME takenlet the distance between a and b be D.From a to b , t1= D T2= D v1 v2So, total distance travelled = D+DTotal time = t1 + t2==> 2D. (D/v1 +D/v2)==>. 2v1v2 v1+v2



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