00:01
We are riding a jet ski at an angle of 35 degrees upstream on a river, flowing with a speed of 2 .8 meters per second.
00:10
Our velocity relative to the ground is 9 .5 meters per second at an angle of 20 degrees upstream.
00:17
Here i've noted our velocities with respect to the water and with respect to the ground in red.
00:26
The one in the river is our velocity relative to the water, and the vector on the ground is our velocity with respect to the ground.
00:36
We are also told that the velocity of the water in the river with respect to the ground is 2 .8 meters per second flowing downwards down the page, and that's drawn in green.
00:50
So the problem wants us to find the speed of the jet ski relative to the water.
00:55
Here, i've noted that vector here as vjw, is jet ski and w is water.
01:07
Let's go ahead and write what we need to find.
01:12
Vjw and using vector addition rules, we know that vjw equals vj ground plus vground.
01:25
Now we have vjw, that's right here...