Posted by **Clarita** on Thursday, March 13, 2008 at 4:18pm.

You are riding on a Jet Ski at an angle of 35¢ª upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 9.5 m/s at an angle of 20.0¢ª upstream, what is the speed of the Jet Ski relative to the water? (Note: angles are measured relative to the x axis)

- Physics -
**drwls**, Thursday, March 13, 2008 at 5:30pm
Use the VECTOR equation

Vwater + Vski/water = Vski/land

Vski/water is the velocity of the Jetski with repect to water, etc..

Vwater is the velocity of the water. Let x be the upstream direction and y be the cross stream direction.

Vwater,x = 2.8 m/s

Vwater,y = 0

Vski/land,x = 9.5 cos 20 = -8.93

Vski,land,y = 9.5 sin 20 = 3.25

Vski/water,x = -8.93 - 2.8 = -11.73 m/s

Vski/water,y = 3.25 m/s

- Physics -
**Anonymous**, Saturday, September 14, 2013 at 9:08pm
13m/s

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