NEET 2015 Physics question
A ship A is moving Westwards with a speed of and a ship B 100 km South of A, is moving Northwards with a speed of . The time after which the distance between them becomes shortest, is :-
Answer: (1)
Solution
Take A at the origin initially, moving along (West) at ; B is at km moving along (North) at . After time : A at , B at . Separation squared: . $ = 400t - 2000
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