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yes

Yes but it will be about 6 p.m. when I post it as I have a meeting after school and I'm teaching all day.

Haven't got time to help right now but if you don't know about things like contact forces you should read my OCR M1 powerpoints - I will send them if you give an email address.

It will be best that you post it on the forum.

I have never done a question of that type, so i can't help you on it.

Which part are you stuck on?

I haven't given much attention to your working, though i will try to explain it.

Now the lower particle(3N) will exert a vertical normal reaction on the upper particle(9N).

The diagram will look like this:




Now resolve the forces,




NB: I forgot to show friction on the diagram.

Does it makes sense?

Sorry for the late response.

We know , sub this in

So we get,

As , hence the coordinates are

Do my answers agree with your book's answers?

When tangent is parallel to the x-axis then its gradient is zero.

Can a denominator be equal to zero?
Denominator being equal to zero mean , is this possilbe?

Give me the exact question.

Sub in x=-10 and y=7, you will get,

Now find the one root by inspection, we can see that p=-1, is a root of the expression. Hence ((p+1) is a factor of the expression, . So to find the other factors divide, by (p+1) using long division.

So in this way you will find the other 2 roots.

So now sub them in to find the possible coordinates.