physics
posted by jay .
A car is traveling at 55.1 km/h on a ﬂat
highway.
The acceleration of gravity is 9.81 m/s
2. a) If the coeﬃcient of kinetic friction between the road and the tires on a rainy day is
0.116, what is the minimum distance needed
for the car to stop
b) What is the stopping distance when the
surface is dry and the coeﬃcient of kinetic
friction is 0.698

First of all, convert 55.1 km/h to 15.3 m/s
2a) The stopping distance X is given by this equation that relates the kinital kinetic energy to the work done against friction:
(1/2)M V^2 = M*g*Uk*X
Notice that the mass M cancels out, which is good since they did not tell you the mass.
X = V^2/(2*g*Uk) = 103 m
2b) Use the same formula, but with the different value of Uk (the kinetic friction corefficient). The stopping distance is much less.
Respond to this Question
Similar Questions

Physics
A car is traveling at 54.2 km/h on a flat highway. The acceleration of gravity is 9.81 m/s^2. PART 1: If the coefficient of kinetic friction between the road and the tires on a rainy day is 0.131, what is the minimum distance needed … 
Phys
i cant get this no matter what i try; A curve of radius 40 m is banked so that a 1070 kg car traveling at 60 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration … 
Physics
A curve of radius 40 m is banked so that a 1070 kg car traveling at 60 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s a)Find … 
Physics
A 1500 kg car moves along a horizontal road at speed v0 = 21.9 m/s. The road is wet, so the static friction coeﬃcient between the tires and the road is only µs = 0.302 and the kinetic friction coeﬃcient is even lower, … 
physics
A car is traveling at 60.6 mph on a horizontal highway. The acceleration of gravity is 9.8 m/s2. If the coefficient of friction between road and tires on a rainy day is 0.056, what is the minimum distance in which the car will stop? 
AP Physics
To test the performance of its tires, a car travels along a perfectly ﬂat (no banking) circular track of radius 120 m. The car increases its speed at uniform rate of at ≡ d v dt = 2.99 m/s 2 until the tires start to … 
physics
A curve of radius 20 m is banked so that a 970 kg car traveling at 50 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s^2 Find the … 
Physics
A car is traveling at 66.9 mi/h on a horizontal highway. The acceleration of gravity is 9.8 m/s2. If the coefficient of friction between road and tires on a rainy day is 0.13, what is the minimum distance in which the car will stop? 
physics
A car is traveling at 58.2 km/h on a ﬂat highway. The acceleration of gravity is 9.8 m/s2 . If the coeﬃcient of friction between the road and the tires on a rainy day is 0.155, what is the minimum distance in which the … 
physics
A car is traveling at 60.6 mph on a horizontal highway. The acceleration of gravity is 9.8 m/s2. If the coefficient of friction between road and tires on a rainy day is 0.056, what is the minimum distance in which the car will stop?