Problem 4: River Safety Whitewater rafting can be dangerous. If you fall out and have to swim, here is the procedure:In all swimming situations, keep your feet up to avoid

foot entrapment. Only put your feet down invery shallow or very calm water. (http://www.nrsweb.com/safety_tips/putin_safety_talk.asp 10/27/2009)Assume you are floating down a river, feet first, in water 3 ft deep, moving with the current at 3 ft/s. Now assume the worst: Your feet get caught by something underwater. What is the force of the current pushing you downstream (and also underwater since your feet are caught)? Use your judgment to assume reasonable values of your body's projected area, etc.