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?

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.

area of focus

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.