Kilometres per hour (km/h) is a widely used metric unit of speed, especially on roads and highways around the world. Interestingly, despite its global prevalence, the U.S. primarily uses miles per hour. However, km/h is the standard for most countries, offering a glimpse into global unity as it’s part of the International System of Units (SI). The history of speed limits tied to km/h is quite fascinating. The first speed limit laws, introduced in the United Kingdom in the 19th century, regulated horse-drawn carriages, long before motor vehicles were common. Today, km/h aids not only in measuring speed but also in showcasing technological advancements in transportation engineering as speeds increase with improved vehicle designs.
Metres per second (m/s) may seem inconspicuous, but it plays a critical role in understanding speed and velocity in scientific contexts. The unit underpins numerous fundamental concepts in physics and engineering, such as calculating the speed of sound at approximately 343 m/s in air at room temperature. This speed metric is also central to space exploration, where spacecraft velocity is often measured in meters per second to ensure precision in navigation and successful missions.
Beyond Earth, Jupiter’s moon, Io, erupts volcanic plumes that reach speeds of over 1,000 m/s, showcasing this unit’s application in celestial phenomena. Transitioning to daily life, elite athletes can clock speeds around 10 m/s during sprints, a testament to human capability. By providing a consistent metric, meters per second serves as a universal bridge across varied disciplines and contexts.
| Kilometres per hour | Metres per second |
|---|---|
0
km/h
|
0
m/s
|
2
km/h
|
0.555556
m/s
|
4
km/h
|
1.11111
m/s
|
6
km/h
|
1.66667
m/s
|
8
km/h
|
2.22222
m/s
|
10
km/h
|
2.77778
m/s
|
12
km/h
|
3.33333
m/s
|
14
km/h
|
3.88889
m/s
|
16
km/h
|
4.44444
m/s
|
18
km/h
|
5
m/s
|
20
km/h
|
5.55556
m/s
|
22
km/h
|
6.11111
m/s
|
24
km/h
|
6.66667
m/s
|
26
km/h
|
7.22222
m/s
|
28
km/h
|
7.77778
m/s
|
30
km/h
|
8.33333
m/s
|
32
km/h
|
8.88889
m/s
|
34
km/h
|
9.44444
m/s
|
36
km/h
|
10
m/s
|
38
km/h
|
10.55556
m/s
|
40
km/h
|
11.11111
m/s
|
42
km/h
|
11.66667
m/s
|
44
km/h
|
12.22222
m/s
|
46
km/h
|
12.77778
m/s
|
48
km/h
|
13.33333
m/s
|
50
km/h
|
13.88889
m/s
|
52
km/h
|
14.44444
m/s
|
54
km/h
|
15
m/s
|
56
km/h
|
15.55556
m/s
|
58
km/h
|
16.11111
m/s
|
60
km/h
|
16.66667
m/s
|
62
km/h
|
17.22222
m/s
|
64
km/h
|
17.77778
m/s
|
66
km/h
|
18.33333
m/s
|
68
km/h
|
18.88889
m/s
|
70
km/h
|
19.44444
m/s
|
72
km/h
|
20
m/s
|
74
km/h
|
20.55556
m/s
|
76
km/h
|
21.11111
m/s
|
78
km/h
|
21.66667
m/s
|
80
km/h
|
22.22222
m/s
|
82
km/h
|
22.77778
m/s
|
84
km/h
|
23.33333
m/s
|
86
km/h
|
23.88889
m/s
|
88
km/h
|
24.44444
m/s
|
90
km/h
|
25
m/s
|
92
km/h
|
25.55556
m/s
|
94
km/h
|
26.11111
m/s
|
96
km/h
|
26.66667
m/s
|
98
km/h
|
27.22222
m/s
|
100
km/h
|
27.77778
m/s
|
102
km/h
|
28.33333
m/s
|
104
km/h
|
28.88889
m/s
|
106
km/h
|
29.44444
m/s
|
108
km/h
|
30
m/s
|
110
km/h
|
30.55556
m/s
|
112
km/h
|
31.11111
m/s
|
114
km/h
|
31.66667
m/s
|
116
km/h
|
32.22222
m/s
|
118
km/h
|
32.77778
m/s
|
120
km/h
|
33.33333
m/s
|
122
km/h
|
33.88889
m/s
|
124
km/h
|
34.44444
m/s
|
126
km/h
|
35
m/s
|
128
km/h
|
35.55556
m/s
|
130
km/h
|
36.11111
m/s
|
132
km/h
|
36.66667
m/s
|
134
km/h
|
37.22222
m/s
|
136
km/h
|
37.77778
m/s
|
138
km/h
|
38.33333
m/s
|
140
km/h
|
38.88889
m/s
|
142
km/h
|
39.44444
m/s
|
144
km/h
|
40
m/s
|
146
km/h
|
40.55556
m/s
|
148
km/h
|
41.11111
m/s
|
150
km/h
|
41.66667
m/s
|
152
km/h
|
42.22222
m/s
|
154
km/h
|
42.77778
m/s
|
156
km/h
|
43.33333
m/s
|
158
km/h
|
43.88889
m/s
|
160
km/h
|
44.44444
m/s
|
162
km/h
|
45
m/s
|
164
km/h
|
45.55556
m/s
|
166
km/h
|
46.11111
m/s
|
168
km/h
|
46.66667
m/s
|
170
km/h
|
47.22222
m/s
|
172
km/h
|
47.77778
m/s
|
174
km/h
|
48.33333
m/s
|
176
km/h
|
48.88889
m/s
|
178
km/h
|
49.44444
m/s
|
180
km/h
|
50
m/s
|
182
km/h
|
50.55556
m/s
|
184
km/h
|
51.11111
m/s
|
186
km/h
|
51.66667
m/s
|
188
km/h
|
52.22222
m/s
|
190
km/h
|
52.77778
m/s
|
192
km/h
|
53.33333
m/s
|
194
km/h
|
53.88889
m/s
|
196
km/h
|
54.44444
m/s
|
198
km/h
|
55
m/s
|
200
km/h
|
55.55556
m/s
|
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