Posted by james on Tuesday, November 23, 2010 at 9:03am.
A ferryboat traveling at a speed of 30 km/h attempts to cross a river with a current of 5 km/h. What is the boat's speed relative to the shore?
A.8 km/h
B.25 km/h
C.30.4 km/h
D.32.8 km/h

Physics  drwls, Tuesday, November 23, 2010 at 9:57am
It depends upon whether the ferry is travelling straight across (but aimed upstream) or aimed straight across (but drifting downsteam). The question does not make clear which it is.
In the first case, the answer is sqrt(30^2 5^2) = 29.6 mph
In the secnd case, the answer is sqrt(30^2 + 5^2) = 30.4 mph

Physics  Anonymous, Monday, May 16, 2011 at 10:47am
32.8 km/h
Answer This Question
Related Questions
 physics  A ferryboat traveling at a speed of 30 km/h attempts to cross a river ...
 physics  A ferryboat traveling at a speed of 30 km/h attempts to cross a river ...
 Physics  A ferryboat traveling at a speed of 30 km/h attempts to cross a river ...
 physic  ferryboat traveling at a speed of 30 km/h attempts to cross a river ...
 Physics  A boat crosses a river of width 113 m in which the current has a ...
 Physics  A boat crosses a river of width 115 m in which the current has a ...
 Physics  A boat crosses a river of width 122 m in which the current has a ...
 science  A boat crossing a .2 mile wide river is heading perpendicularly ...
 physics  A boat crosses a river of width 98.4 m in which the current has a ...
 physics  A boat crosses a river of width 120 m in which the current has a ...
More Related Questions