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i just DO NOT knw hw to check my answers from marking schemes. ugh! iv asked this ealier too, but I stillc an't get this A1 B1 C1 thing. Some one please help. here is the question paper http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s12_qp_21.pdf. question 2 part b sub part 1. here is what the marking scheme says, http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s12_ms_21.pdf. and this is what I wrote: The resistance between water and the board is equal in magnitude and opposite in direction of the force exerted by the wind to force the sail forward. How many marks do I get??