# Homework Help: Equations for physics problem

1. Oct 10, 2015

### Drizzy

end result 1. The problem statement, all variables and given/known data

So I have equation 1,2 and 3. And the end result should be the last equation. How am I going to get that answer?
2. Relevant equations

3. The attempt at a solution

I have come so far:

2. Oct 10, 2015

### haruspex

Images of working make it hard to write a response that refers to specific steps.
Your working down to the fifth line (including the rehash of given equations 1 and 2) is ok, but you seem to have cancelled some wrong terms to get the sixth line.

3. Oct 10, 2015

### Drizzy

oops. the sixth step should be:

(Vvy)^2 + (Vsy)^2 =2Vvx * Vsx

The terms that I cancelled out have a line underneath.

How do I move forward from this?

4. Oct 10, 2015

### Staff: Mentor

The 4th line in your solution is incorrect. You should be able to solve for 2vvxvsx. In your 3rd equation, try moving the vsy to the other side, and then squaring the resulting equation. What do you get?

Chet

5. Oct 10, 2015

### Drizzy

6. Oct 10, 2015

### haruspex

Follow Chet's hint at what to do with eqn 3.

7. Oct 10, 2015

### Drizzy

I moved it to the right

8. Oct 10, 2015

### haruspex

Well, after squaring both sides, what did you get? Did one side resemble one side of the second line of your post #5?

9. Oct 10, 2015

### Drizzy

My answer is sqrt of what I wrote but that is wrong. The answer should be the last equation in my first pricture.

10. Oct 10, 2015

### haruspex

ok, I see the confusion. Chet wrote:
But by 3rd eqn I think he meant eqn (2) in the problem statement. Try it with that.

11. Oct 10, 2015

Yes. Thanks.