A-Level Maths: R4-13 Forces: Smooth Inclined Plane Example 1

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Thank you so so much; I think you are God-sent!

akosuafrimpong
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Is it acceptable to use symbols ∥ and ⊥ to represent the parallel and perpendicular sections respectively in the exam? Or do I have to write out the "parallel to the plane" and "perpendicular to the plane" parts?

kingvadanite
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What do you mean by parallel to the plane and perpendicular to the plane?

karotic
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I donot get why you equate 2sin30 to 2a

ashleymoody