Foot per second (ft/s) is a unit commonly used to measure velocity, particularly in the United States. It’s fascinating to note that this unit offers a unique perspective on speed, especially when compared to more universal units like meters per second. For instance, the speed of sound travels at approximately 1,125 feet per second, illustrating just how fast sound waves can move. Moreover, this unit is an essential part of the British Imperial and U.S. customary systems, embodying the historical evolution of measurement standards.
Interestingly, foot per second was also a critical measure in ancient construction and engineering, where precision in the rate of stone placement or water flow impacted architectural marvels. Today, it’s frequently applied in sports science to analyze athletic performances, such as a sprinter’s burst off the starting blocks or the flight speed of a baseball pitcher’s throw. This unit continues to bridge past engineering feats with modern technological applications, providing a unique linkage of history and contemporary science.
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.
Feet per second | Kilometres per hour |
---|---|
0
ft/s
|
0
km/h
|
1
ft/s
|
1.09728
km/h
|
2
ft/s
|
2.19456
km/h
|
3
ft/s
|
3.29184
km/h
|
4
ft/s
|
4.38912
km/h
|
5
ft/s
|
5.4864
km/h
|
6
ft/s
|
6.58368
km/h
|
7
ft/s
|
7.68096
km/h
|
8
ft/s
|
8.77824
km/h
|
9
ft/s
|
9.87552
km/h
|
10
ft/s
|
10.9728
km/h
|
11
ft/s
|
12.07008
km/h
|
12
ft/s
|
13.16736
km/h
|
13
ft/s
|
14.26464
km/h
|
14
ft/s
|
15.36192
km/h
|
15
ft/s
|
16.4592
km/h
|
16
ft/s
|
17.55648
km/h
|
17
ft/s
|
18.65376
km/h
|
18
ft/s
|
19.75103
km/h
|
19
ft/s
|
20.84831
km/h
|
20
ft/s
|
21.94559
km/h
|
21
ft/s
|
23.04287
km/h
|
22
ft/s
|
24.14015
km/h
|
23
ft/s
|
25.23743
km/h
|
24
ft/s
|
26.33471
km/h
|
25
ft/s
|
27.43199
km/h
|
26
ft/s
|
28.52927
km/h
|
27
ft/s
|
29.62655
km/h
|
28
ft/s
|
30.72383
km/h
|
29
ft/s
|
31.82111
km/h
|
30
ft/s
|
32.91839
km/h
|
31
ft/s
|
34.01567
km/h
|
32
ft/s
|
35.11295
km/h
|
33
ft/s
|
36.21023
km/h
|
34
ft/s
|
37.30751
km/h
|
35
ft/s
|
38.40479
km/h
|
36
ft/s
|
39.50207
km/h
|
37
ft/s
|
40.59935
km/h
|
38
ft/s
|
41.69663
km/h
|
39
ft/s
|
42.79391
km/h
|
40
ft/s
|
43.89119
km/h
|
41
ft/s
|
44.98847
km/h
|
42
ft/s
|
46.08575
km/h
|
43
ft/s
|
47.18303
km/h
|
44
ft/s
|
48.28031
km/h
|
45
ft/s
|
49.37759
km/h
|
46
ft/s
|
50.47487
km/h
|
47
ft/s
|
51.57215
km/h
|
48
ft/s
|
52.66943
km/h
|
49
ft/s
|
53.76671
km/h
|
50
ft/s
|
54.86399
km/h
|
51
ft/s
|
55.96127
km/h
|
52
ft/s
|
57.05854
km/h
|
53
ft/s
|
58.15582
km/h
|
54
ft/s
|
59.2531
km/h
|
55
ft/s
|
60.35038
km/h
|
56
ft/s
|
61.44766
km/h
|
57
ft/s
|
62.54494
km/h
|
58
ft/s
|
63.64222
km/h
|
59
ft/s
|
64.7395
km/h
|
60
ft/s
|
65.83678
km/h
|
61
ft/s
|
66.93406
km/h
|
62
ft/s
|
68.03134
km/h
|
63
ft/s
|
69.12862
km/h
|
64
ft/s
|
70.2259
km/h
|
65
ft/s
|
71.32318
km/h
|
66
ft/s
|
72.42046
km/h
|
67
ft/s
|
73.51774
km/h
|
68
ft/s
|
74.61502
km/h
|
69
ft/s
|
75.7123
km/h
|
70
ft/s
|
76.80958
km/h
|
71
ft/s
|
77.90686
km/h
|
72
ft/s
|
79.00414
km/h
|
73
ft/s
|
80.10142
km/h
|
74
ft/s
|
81.1987
km/h
|
75
ft/s
|
82.29598
km/h
|
76
ft/s
|
83.39326
km/h
|
77
ft/s
|
84.49054
km/h
|
78
ft/s
|
85.58782
km/h
|
79
ft/s
|
86.6851
km/h
|
80
ft/s
|
87.78238
km/h
|
81
ft/s
|
88.87966
km/h
|
82
ft/s
|
89.97694
km/h
|
83
ft/s
|
91.07422
km/h
|
84
ft/s
|
92.1715
km/h
|
85
ft/s
|
93.26878
km/h
|
86
ft/s
|
94.36605
km/h
|
87
ft/s
|
95.46333
km/h
|
88
ft/s
|
96.56061
km/h
|
89
ft/s
|
97.65789
km/h
|
90
ft/s
|
98.75517
km/h
|
91
ft/s
|
99.85245
km/h
|
92
ft/s
|
100.94973
km/h
|
93
ft/s
|
102.04701
km/h
|
94
ft/s
|
103.14429
km/h
|
95
ft/s
|
104.24157
km/h
|
96
ft/s
|
105.33885
km/h
|
97
ft/s
|
106.43613
km/h
|
98
ft/s
|
107.53341
km/h
|
99
ft/s
|
108.63069
km/h
|
100
ft/s
|
109.72797
km/h
|
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