The area of a square field is 36 m2. How long would it take for a bird to cross it diagonally flying at the rate of 30 √2 m/min?
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Answer: 12 seconds
Explanation:
Length of diagonal of square = √(s² + s²) = √(2s²)
= √(2×36) = 6√2 m
Time = Displacement/Velocity = (6√2)/(30√2) = 1/5 minute
= 60/5 seconds
= 12 seconds
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