Asked by mm

The function D (t) = 13t^2 to the second power – 120t gives the distance a car going a certain speed will skid in t seconds. Find the time it would take for the car to skid 170 feet.
The time to skid 170 feet is __________ seconds.
Answered by bobpursley
170=13t^2-120t

solve the quadratic...

t=(120+-sqrt(120^2+4*170))/26
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