1. Suppose you and a pair of life preserves are
floating down a swift river, as shown. You wish to get to either of the life
preservers for safety. On is 3 meters downstream from you and the other is 3
meters upstream from you. Which can you swim to in the shortest time?
a) The preserver upstream.
b) The preserver downstream.
c) Both require the same time.
2. An airplane makes a straight back-and-forth round trip, always at the same airspeed, between two cities. If it encounters a mild steady tailwind going, and the same steady headwind returning, will the round trip take more, less, or the same time as with no wind?
a) The preserver upstream.
b) The preserver downstream.
c) Both require the same time.
2. An airplane makes a straight back-and-forth round trip, always at the same airspeed, between two cities. If it encounters a mild steady tailwind going, and the same steady headwind returning, will the round trip take more, less, or the same time as with no wind?
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