Q15. As shown in the image below, a man starts from point A, and tries to swim across a 40-ft wide river to point B on the other side, downstream at a distance d. The river flows with a constant velocity v₁ = 2.1 ft/s, with direction shown in the image. The man can swim at a speed Vm/r = 5.2 ft/s in still water (which is the relative constant speed with respective to the flowing water). If the distance d = 52 ft, determine the magnitude of the man's absolute speed vm (with the effect of the flowing water) so he can arrive at point B. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper unit. Vr 40 ft d B d Vm/r Vr Ez 40 ft V m B

Q15. As shown in the image below, a man starts from point A, and tries to swim across a 40-ft wide river to point B on the other side, downstream at a distance d. The river flows with a constant velocity v₁ = 2.1 ft/s, with direction shown in the image. The man can swim at a speed Vm/r = 5.2 ft/s in still water (which is the relative constant speed with respective to the flowing water). If the distance d = 52 ft, determine the magnitude of the man's absolute speed vm (with the effect of the flowing water) so he can arrive at point B. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper unit. Vr 40 ft d B d Vm/r Vr Ez 40 ft V m B

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