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 (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 | Kilometres per hour |
|---|---|
0
m/s
|
0
km/h
|
1
m/s
|
3.6
km/h
|
2
m/s
|
7.2
km/h
|
3
m/s
|
10.8
km/h
|
4
m/s
|
14.4
km/h
|
5
m/s
|
18
km/h
|
6
m/s
|
21.6
km/h
|
7
m/s
|
25.2
km/h
|
8
m/s
|
28.8
km/h
|
9
m/s
|
32.4
km/h
|
10
m/s
|
36
km/h
|
11
m/s
|
39.6
km/h
|
12
m/s
|
43.2
km/h
|
13
m/s
|
46.8
km/h
|
14
m/s
|
50.4
km/h
|
15
m/s
|
54
km/h
|
16
m/s
|
57.6
km/h
|
17
m/s
|
61.2
km/h
|
18
m/s
|
64.8
km/h
|
19
m/s
|
68.4
km/h
|
20
m/s
|
72
km/h
|
21
m/s
|
75.6
km/h
|
22
m/s
|
79.2
km/h
|
23
m/s
|
82.8
km/h
|
24
m/s
|
86.4
km/h
|
25
m/s
|
90
km/h
|
26
m/s
|
93.6
km/h
|
27
m/s
|
97.2
km/h
|
28
m/s
|
100.8
km/h
|
29
m/s
|
104.4
km/h
|
30
m/s
|
108
km/h
|
31
m/s
|
111.6
km/h
|
32
m/s
|
115.2
km/h
|
33
m/s
|
118.8
km/h
|
34
m/s
|
122.4
km/h
|
35
m/s
|
126
km/h
|
36
m/s
|
129.6
km/h
|
37
m/s
|
133.2
km/h
|
38
m/s
|
136.8
km/h
|
39
m/s
|
140.4
km/h
|
40
m/s
|
144
km/h
|
41
m/s
|
147.6
km/h
|
42
m/s
|
151.2
km/h
|
43
m/s
|
154.8
km/h
|
44
m/s
|
158.4
km/h
|
45
m/s
|
162
km/h
|
46
m/s
|
165.6
km/h
|
47
m/s
|
169.2
km/h
|
48
m/s
|
172.8
km/h
|
49
m/s
|
176.4
km/h
|
50
m/s
|
180
km/h
|
51
m/s
|
183.6
km/h
|
52
m/s
|
187.2
km/h
|
53
m/s
|
190.8
km/h
|
54
m/s
|
194.4
km/h
|
55
m/s
|
198
km/h
|
56
m/s
|
201.6
km/h
|
57
m/s
|
205.2
km/h
|
58
m/s
|
208.8
km/h
|
59
m/s
|
212.4
km/h
|
60
m/s
|
216
km/h
|
61
m/s
|
219.6
km/h
|
62
m/s
|
223.2
km/h
|
63
m/s
|
226.8
km/h
|
64
m/s
|
230.4
km/h
|
65
m/s
|
234
km/h
|
66
m/s
|
237.6
km/h
|
67
m/s
|
241.2
km/h
|
68
m/s
|
244.8
km/h
|
69
m/s
|
248.4
km/h
|
70
m/s
|
252
km/h
|
71
m/s
|
255.6
km/h
|
72
m/s
|
259.2
km/h
|
73
m/s
|
262.8
km/h
|
74
m/s
|
266.4
km/h
|
75
m/s
|
270
km/h
|
76
m/s
|
273.6
km/h
|
77
m/s
|
277.2
km/h
|
78
m/s
|
280.8
km/h
|
79
m/s
|
284.4
km/h
|
80
m/s
|
288
km/h
|
81
m/s
|
291.6
km/h
|
82
m/s
|
295.2
km/h
|
83
m/s
|
298.8
km/h
|
84
m/s
|
302.4
km/h
|
85
m/s
|
306
km/h
|
86
m/s
|
309.6
km/h
|
87
m/s
|
313.2
km/h
|
88
m/s
|
316.8
km/h
|
89
m/s
|
320.4
km/h
|
90
m/s
|
324
km/h
|
91
m/s
|
327.6
km/h
|
92
m/s
|
331.2
km/h
|
93
m/s
|
334.8
km/h
|
94
m/s
|
338.4
km/h
|
95
m/s
|
342
km/h
|
96
m/s
|
345.6
km/h
|
97
m/s
|
349.2
km/h
|
98
m/s
|
352.8
km/h
|
99
m/s
|
356.4
km/h
|
100
m/s
|
360
km/h
|
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