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A car is travelling at a speed of 60 km/hr on a section of a National Highway having a downward gradient of 2%. The driver of the car suddenly observes a stopped vehicle on the car path at a distance of 130 m ahead, and applies brake. If the brake efficiency is 60%, coefficient of friction is 0.7, driver's reaction time is 2.5 s, and acceleration due to gravity is 9.81 m/s², the distance (in meters) required by the driver to bring the car to a safe stop lies in the range
- 126 to 130
- 41 to 45
- 33 to 37
- 75 to 79
Correct answer: 75 to 79
Solution
The correct option is right because, after accounting for the driver's reaction time and the effective braking distance, the total stopping distance falls within the range of 75 to 79 meters, considering the car's initial speed, gradient, and braking efficiency.
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