Craig is an accident reconstructionist. He arrives at an accident where there are 4 skid marks of different lengths. He finds their measures to be 85 ft, 92 ft, 88 ft, and 90 ft. It is an asphalt road with a drag factor of 0.8. Because he does not know the efficiency of the driver's brakes, he assumes a brake efficiency of 80%. What is the minimum speed the driver could have been going?
A. 31.6 mph
B. 38.2 mph
C. 41.3 mph
D. 46.2 mph
Answer: C
You might also like to view...
Find the flux of the vector field F across the surface S in the indicated direction.F(x, y, z) = 3i + 9j + 5k , S is the rectangular surface z = 0, 0 ? x ? 5, and 0 ? y ? 4, direction k
A. 60 B. 180 C. 0 D. 100
Find the mean.The grocery expenses for six families were 
, 
, 
, 
, 
, and 
. What is the mean grocery bill? Round your answer to the
nearest cent. A. $79.79 B. $66.49 C. $99.74 D. $67.79
Solve the problem.Amy has 2 blue, 3 red, and 4 green books to arrange on a shelf. In how many ways can the books be arranged if books of the same color must be grouped together? (Assume that books of the same color are distinguishable.)
A. 32 B. 6 C. 1728 D. 288
The mean is sometimes called the arithmetic mean to distinguish it from other possible means. For example, a different mean, called the harmonic mean (H.M.), is used to average speeds. This mean is defined to be the sum of the reciprocals of all scores divided into the number of scores. For example, the harmonic mean of the numbers 4, 5, 6, 6, 7, 8 is
?
?
Find the arithmetic mean and the harmonic mean of the numbers 2, 2, 4, 4, 7, 8, 8, 9, 9, and 10.
?
Round your answers to the nearest hundredth.
?
A. 
B. 
C. ?
D. ?
E. ?