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What is the correct answer?

4

A car goes round a curve of radius 100 m at 25 m/sec. The angle to the horizontal at which the road must be banked to prevent sideways friction on the car wheels is tan1 x, where x is (Assume g = 10 m/sec²)

A. 3/8

B. 1/2

C. 9/5

D. 5/8

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