JEE Advanced Mathematics question
Not in JEE syllabus
A man from the top of a 100-metre-high tower sees a car moving towards the tower at an angle of depression of . After some time, the angle of depression becomes . The distance (in metres) travelled by the car during the time is
Answer: (B)
Solution
*(Figure: tower PQ = 100 m; car first at R (depression 30°), later at S (depression 60°), with Q, S, R collinear; x = SR.)*
,
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