The document shows a graph that illustrates the relationship between vehicle speed, stopping distance, and friction coefficient. It indicates that as speed increases, stopping distance increases exponentially. It also shows that higher friction coefficients allow vehicles to stop in shorter distances. Specifically, at any given speed, increasing the friction coefficient from 0.2 to 0.8 can decrease the stopping distance by over 200 meters. The graph provides a visual representation of how different factors impact braking and stopping distances.

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25. The relation between vehicle speed and stop-distance
540
530
520
510
Friction coefficient
500
490
f =.2
480
f =.3
470
f =.4
460
450
f =.5
440
f =.6
430
f =.7
420
410
f =.8
400
390
380
370
360
350
340
330
Distance (m)
320
310
300
290
280
270
260
250
240
230
220
210
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
Maj.eng / Ayman eldabaa
10
0
0
10
20
30
40
50
60
70
80
90
100
Speed (km/hr)
110
120
130
140
150
160

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