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Do anyone has this marking scheme? I´ve been looking it for ages everywhere around the internet but i´ve not been able to have... anyone has it? if anyone does ill appreciate it so much!!

Ok the first thing to do is to draw a nice neat diagram with all the forces labelled on it.

Now you know that $f=\mu R$ and you know $R$ so you can use that.

You can alos find out cos and sin alpha as they give you tan alpha.

Now resolve up the plane and you will have to use F=ma.

Try using this method and see how far you get.

Now you know that $f=\mu R$ and you know $R$ so you can use that.

You can alos find out cos and sin alpha as they give you tan alpha.

Now resolve up the plane and you will have to use F=ma.

Try using this method and see how far you get.

Wooohhooo~~~ Thank you for posting up the mark scheme~

Question 5 c when the answer is 0.45... i got 0.9 and i dont know how the person used r = mg ? if someone could explain that would be real help

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