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## Homework Statement

Hi guys. Just wondering if anyone could help me with Q7 part a) on the pdf I have attached below. I think my working are not correct but I cant see other way. If I add 6. and 7. together I would get an ans in terms of what the question is asking but I am not sure if that is correct?

[ note: cropped image inserted by moderator ]

## Homework Equations

1.$$y=y_0+v_{0y}(t)+\frac{1}{2}at^2$$

2.$$E_y=\frac{F_y}{q}$$

3. $$F_y=-mg$$

## The Attempt at a Solution

4.$$y_0=0, v_y=0 ,\uparrow=+, v_{x0}$$

5.$$E_y=\frac{-mg}{q}, g=\frac{E_yq}{m}$$

So by subbing in the 4 and 5 values into 1 I get two equations as shown below:

6.$$y=-\frac{1}{2}g(\frac{d}{v_{x0}})^2$$

and

7.

**$$y=-\frac{1}{2}(\frac{E_yq}{m})(\frac{d}{v_{x0}})^2$$**

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