A ball is fired from origin with speed u such that it crosses the point (a,b). Find the minimum value of u for doing so?
回答 (1)
2015-05-06 4:22 pm
[sqrt(a^2+b^2)]/t
a bit of logic and a bit of guess.
a bit of logic and a bit of guess.
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https://hk.answers.yahoo.com/question/index?qid=20150506081424AACx54q