Sharp el-9950

132
CONCEPT
1. Youcancalculateallanswersindividually,butifyouuselist,you
can obtain the results with one calculation.
PROCEDURE
Enter each speed value in the list
2. Press
# C
to enter
the calculation screen.
3. Press
@
{
30
,
40
,
50
,
60
,
70
,
80
@
}
The calculator displays the set of data.
Chapter 7
List Features
1. Try it!
Byanalyzingyearsofdata,wefoundthatittakesthedriverofacar
approximately 0.75 seconds to react to a situation before actually applying the
brakes. Once the brake pedal is depressed, it takes additional time for the car to
cometoacompletestop.Hereistheequationusedtocomputetotalstopping
distance on dry, level concrete:
The reaction time distance (in feet) = 1.1 times the speed (in miles per hour);
The braking distance = 0.06 times the speed squared;
y = 1.1
×
v + 0.06
×
v
2
,
where y represents the total stopping distance (in
feet),andvrepresentsthespeed(miles/hour)
Calculatethetotalstoppingdistancesatthe
speeds of 30, 40, 50, 60, 70, 80 miles per hour.