Aleksander Krol
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for Q10 part 'a' for the position vector of S, i don't get, why did they use r = 500i + t(−3i + 15j). In the question S is 500m due east of O, (which means 500i) and it is moving with constant velocity (23i + 15j) ms^-1.
so we use r= ro + vt to find the position vector of S after t seconds.
so, r= 500i + (23i + 15j)t right ? Name:  Screenshot_20210727-192154_Chrome.jpg
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Last edited by Aleksander Krol; 1 month ago
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mqb2766
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Looks like a fairly obvious typo in the question or mark scheme. Depending on they did for part b), I'd just either reexpress the question or modify the mark scheme.
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