# Thread: Relative velocity questions

1. ## Relative velocity questions

1. A small plane flying into the wind takes 3 h 20 min to complete a flight of 960 Km. Flying with the wind, the same plane takes 2 h 30 min to make the trip. What is the speed of the wind? What is the speed of the plane?
2. A hovercraft travels over flat land at 40 km/h and over rough water at 10 km/h. If it takes 5.75 h to travel over 185 km, then how far did it travel over land, and water.
3. In a white water relay race, one kayak team averaged 26 km/h downstream, but only 6 km/h upstream in the white water course. What was the rate of the kayak in still water? What was the rate of the current?

2. Originally Posted by Soy
1. A small plane flying into the wind takes 3 h 20 min to complete a flight of 960 Km. Flying with the wind, the same plane takes 2 h 30 min to make the trip. What is the speed of the wind? What is the speed of the plane?
2. A hovercraft travels over flat land at 40 km/h and over rough water at 10 km/h. If it takes 5.75 h to travel over 185 km, then how far did it travel over land, and water.
3. In a white water relay race, one kayak team averaged 26 km/h downstream, but only 6 km/h upstream in the white water course. What was the rate of the kayak in still water? What was the rate of the current?
What have tried here? where do you get stuck? Can you show any work so that we can identify your mistakes?

3. Originally Posted by VonNemo19
What have tried here? where do you get stuck? Can you show any work so that we can identify your mistakes?
i understand none of it.

4. Originally Posted by Soy
i understand none of it.
Then I recommend you speak to your professor and see what can be done to withdrawl from the course. This is a hard reality to face, but it is a reality all the same.

5. Originally Posted by VonNemo19
Then I recommend you speak to your professor and see what can be done to withdrawl from the course. This is a hard reality to face, but it is a reality all the same.
Can you at least try to help me?!

6. Originally Posted by Soy
Can you at least try to help me?!
Tell me where I should begin.

With algebra? Word problems? Physical principals?

You should not be angry with me right now. Just tell me what the trouble is. Is this a homework assignment?

I will say that each problem involves the relationship: $\displaystyle d=rt$

7. Originally Posted by Soy
Can you at least try to help me?!
If you understand none of the problem then in most cases we won't be able to help you because teaching a new topic takes a lot of time, typing and patience. Also you should only post 1 problem per thread and try to show some work. If you can't do anything, post your thoughts on what you get stuck on.

Relative velocity in two dimensions is all about giving each vector a direction. If the two vectors (like wind velocity and plane velocity) go in the same direction, then the individual velocities are added. If they go in opposite directions they are subtracted and go in the direction of the larger vector.

Also use:

Distance = Rate x Time

That's the info you need to use but again we can't teach you, only help you.