Chinook Salmon is capable to move via water especially fast by jumping out of the water periodically. This behavior is termed as porpoising. Assume that a salmon swimming in still water jumps out of the water having velocity 6.26 m/s at 45.0 degrees over the horizontal, sails via the air a distance L before returning to the water, and then swims the similar distance L underwater in a straight, horizontal line having velocity 3.58 m/s before jumping out again.
i) Find out the average velocity of the fish for the whole process of jumping and swimming underwater.
ii) Let, consider the time interval needed to travel the whole distance of 2L. By what percentage is this time interval decreased by the jumping/swimming procedure as compared with simply swimming underwater at 3.58 m/s?