Question of Exercise 4

Friction of Class 8

A car is going at a speed of 21.6 km/hr when it encounters a 12.8 m long slope of angle 30° (figure]. The friction coefficient between the road and the tyre is 1/2. Show that no matter how hard the driver applies the brakes, the car will reach the bottom with a speed greater than 36 km/hr. Take g = 10 m/s 2.  


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