Question

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 1

Answer:

2v1v2

v1+v2

Explanation:

Average speed =Total distance travelled

Total time taken

let the distance between a and b be D.

From a to b ,

t1= D t2= D

v1 v2

So,

total distance travelled = D+D

Total time = t1 + t2

==> 2D.

(D/v1 +D/v2)

==>. 2v1v2

v1+v2