Posted by Melissa on Wednesday, September 15, 2010 at 8:28pm.
Mary needs to row her boat across a 120 m wide river that is flowing to the east at a speed of 1.4 m/s. Mary can row the boat with a speed of 2.0 m relative to the water.
1. How long does it take Mary to reach the opposite river bank ?
2.If Mary rows straight north, how far downstream will she land?

physics  bobpursley, Wednesday, September 15, 2010 at 8:35pm
Look at this in directions.
She rows North at 2.0m/s, and the distance is 120M North.
time= distanceN/speedN= 120m/2.0m/s=60sec
Where does she land. YOu have 2.0m/s across, downstream 1.4m/s
In 60 seconds, she goes distance=1.4*60 m
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