Joe is trying to pick up Ryan who is waiting directly across the river. Joe heads straight across the river in his kayak at a velocity of 5 kilometers per hour, but the river current flowing at 5.2 kilometers per hour pushes him downstream. The actual velocity of his kayak is 7.21 Km/h.
If it takes Joe 25.2 seconds to cross the river, how far downstream (in meters) does Ryan have to walk to get in the boat?
2007-09-18 11:46:03 · 1 answers · asked by Brian 4 in Science & Mathematics ➔ Physics
I wish you were not joking, I mean that you are a contributor with good math knowledge.
If it takes Joe 25.2 seconds to cross the river, (since he heads straight across the river in his kayak) it also takes the river current 25.2 seconds to push Joe downstream.
Assume that Joe could stop his kayak as soon as he reaches the other side of the river, the current would carry him for a total distance of:
25.2s*5200m/(3600s) = 36.4m
That is the distance Ryan have to walk to get in the boat.
2007-09-18 14:52:00 · answer #1 · answered by Hahaha 7 · 0⤊ 0⤋