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Answer :
The average skid mark for the car is 91.7 feet. Option D
How to calculate the average skid
The average skid mark can be calculated by the formula -
S = ✓30Dfn,
where;
s is speed of car,
D is skid distance,
f is drag factor and
n is braking efficiency.
Using the values in formula to calculate the value of D.
55 = ✓30 × D × 1.1 × 1
Performing multiplication on Right Hand Side of the equation
55 = ✓D × 33
Taking square on both sides of the equation
D = 55² ÷ 33
Taking square on numerator on Right Hand Side of the equation
D = 3025 ÷ 33
Performing division on Right Hand Side of the equation
D = 98.45 feet
Rounding to the nearest tenth of a foot
D = 91.7 feet
Hence, the average skid mark is 91.7 feet.
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