How do I do this question? PHYSICS A LEVEL.

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MKaur18
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So I understand the mark scheme for 3a(iii) and 3a(iv). But in 3a(iv) why is it cos(24) and not sin(24)? Isn't cos(x) usually used when using horizontal forces? By the way this past paper is from June 2014 unit 2 physics.
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