M Wiley PLUS Chegg.com Apps ice Assignment ent C edugen.wileyplus.com/edugen/stu
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M Wiley PLUS Chegg.com Apps ice Assignment ent C edugen.wileyplus.com/edugen/student/mainfr.uni HP Connected Watch NHL Live Stre... watch NBA Live Str... Gradebook ORION FULL SCREEN PRINTER VERSION BACK NEXT Question 20 A boat is traveling upstream at 11 km/h with respect to the water of a river. The water is flowing at 8.0 km/h with respect to the ground. What are the (a) magnitude and (b) direction of the boat's velocity with respect to the ground? A child on the boat walks from front to rear at 4.0 km/h with respect to the boat.What are the (c) magnitude and (d) direction of the child's velocity with respect to the ground? (a) Number Units (b) (c) Number Units (d) SHOW HINT Question Attempts: 0 of 8 used SAVE FOR LATER SUBMIT ANSWER Copyright 2000-2016 by John Wiley & Sons, Inc. or related companies. All rights reserved. 1:15 PM 2/13/2016Explanation / Answer
From the perspective of the ground, the speed of the boat would be:
v(boat) = 11 km/h - 8.0 km/h = 3 km/h
Because it requires 8 of your km/h to overcome the upstream speed of the water trying to push you down, so with respect to the ground, your boat is going much slower.
As for the child, the child is walking against the motion of the boat, but from the perspective of the ground, the child is already traveling at 3 km/h. So the speed of the child, with respect to the ground, is:
v(child) = 3 km/h - 4 km/h = -1 km/h i.e v(child) = 1 km/h downstream side
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