A car travels on a circular racetrack of radius 50 m, which is banked at an angle . If the car travels at a speed 10 ms -1 , then the wear and tear on its tyres is minimum. Taking the acceleration due to gravity to be 10 ms -2 , the value of is:

1. A. -1 ( 1 5 )
2. B. -1 ( 2 5 )
3. C. -1 ( 3 /2)
4. D. -1 (2 3 )

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