Question

Two friends are travelling downstream on a raft drifting along with the same speed as the river. At ???? = 0, Friend-1 jumps off the raft and start swimming downstream. At ???? = 30 m????????, Friend-1 turns around and starts swimming upstream until he reaches the raft. By this time the raft has drifted 2 ????m downstream. Friend-1 swims at a constant speed relative to the river. a) Find the speed of the river. b) How does your answer to part a) depend on the Friend-1’s speed relative to the river?

Answer 1

Answer:

Explanation:

The careful analysis and step by step calculation is as shown in the attachment.

b) The answer is independent on the value of V1, since we are sure that whatever value V1 takes, friend 1 will still take the same time in going away and coming back.