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.
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 | Feet per second |
---|---|
0
km/h
|
0
ft/s
|
2
km/h
|
1.82269
ft/s
|
4
km/h
|
3.64538
ft/s
|
6
km/h
|
5.46807
ft/s
|
8
km/h
|
7.29076
ft/s
|
10
km/h
|
9.11345
ft/s
|
12
km/h
|
10.93614
ft/s
|
14
km/h
|
12.75883
ft/s
|
16
km/h
|
14.58151
ft/s
|
18
km/h
|
16.4042
ft/s
|
20
km/h
|
18.22689
ft/s
|
22
km/h
|
20.04958
ft/s
|
24
km/h
|
21.87227
ft/s
|
26
km/h
|
23.69496
ft/s
|
28
km/h
|
25.51765
ft/s
|
30
km/h
|
27.34034
ft/s
|
32
km/h
|
29.16303
ft/s
|
34
km/h
|
30.98572
ft/s
|
36
km/h
|
32.80841
ft/s
|
38
km/h
|
34.6311
ft/s
|
40
km/h
|
36.45379
ft/s
|
42
km/h
|
38.27648
ft/s
|
44
km/h
|
40.09916
ft/s
|
46
km/h
|
41.92185
ft/s
|
48
km/h
|
43.74454
ft/s
|
50
km/h
|
45.56723
ft/s
|
52
km/h
|
47.38992
ft/s
|
54
km/h
|
49.21261
ft/s
|
56
km/h
|
51.0353
ft/s
|
58
km/h
|
52.85799
ft/s
|
60
km/h
|
54.68068
ft/s
|
62
km/h
|
56.50337
ft/s
|
64
km/h
|
58.32606
ft/s
|
66
km/h
|
60.14875
ft/s
|
68
km/h
|
61.97144
ft/s
|
70
km/h
|
63.79413
ft/s
|
72
km/h
|
65.61682
ft/s
|
74
km/h
|
67.4395
ft/s
|
76
km/h
|
69.26219
ft/s
|
78
km/h
|
71.08488
ft/s
|
80
km/h
|
72.90757
ft/s
|
82
km/h
|
74.73026
ft/s
|
84
km/h
|
76.55295
ft/s
|
86
km/h
|
78.37564
ft/s
|
88
km/h
|
80.19833
ft/s
|
90
km/h
|
82.02102
ft/s
|
92
km/h
|
83.84371
ft/s
|
94
km/h
|
85.6664
ft/s
|
96
km/h
|
87.48909
ft/s
|
98
km/h
|
89.31178
ft/s
|
100
km/h
|
91.13447
ft/s
|
102
km/h
|
92.95716
ft/s
|
104
km/h
|
94.77984
ft/s
|
106
km/h
|
96.60253
ft/s
|
108
km/h
|
98.42522
ft/s
|
110
km/h
|
100.24791
ft/s
|
112
km/h
|
102.0706
ft/s
|
114
km/h
|
103.89329
ft/s
|
116
km/h
|
105.71598
ft/s
|
118
km/h
|
107.53867
ft/s
|
120
km/h
|
109.36136
ft/s
|
122
km/h
|
111.18405
ft/s
|
124
km/h
|
113.00674
ft/s
|
126
km/h
|
114.82943
ft/s
|
128
km/h
|
116.65212
ft/s
|
130
km/h
|
118.47481
ft/s
|
132
km/h
|
120.29749
ft/s
|
134
km/h
|
122.12018
ft/s
|
136
km/h
|
123.94287
ft/s
|
138
km/h
|
125.76556
ft/s
|
140
km/h
|
127.58825
ft/s
|
142
km/h
|
129.41094
ft/s
|
144
km/h
|
131.23363
ft/s
|
146
km/h
|
133.05632
ft/s
|
148
km/h
|
134.87901
ft/s
|
150
km/h
|
136.7017
ft/s
|
152
km/h
|
138.52439
ft/s
|
154
km/h
|
140.34708
ft/s
|
156
km/h
|
142.16977
ft/s
|
158
km/h
|
143.99246
ft/s
|
160
km/h
|
145.81515
ft/s
|
162
km/h
|
147.63783
ft/s
|
164
km/h
|
149.46052
ft/s
|
166
km/h
|
151.28321
ft/s
|
168
km/h
|
153.1059
ft/s
|
170
km/h
|
154.92859
ft/s
|
172
km/h
|
156.75128
ft/s
|
174
km/h
|
158.57397
ft/s
|
176
km/h
|
160.39666
ft/s
|
178
km/h
|
162.21935
ft/s
|
180
km/h
|
164.04204
ft/s
|
182
km/h
|
165.86473
ft/s
|
184
km/h
|
167.68742
ft/s
|
186
km/h
|
169.51011
ft/s
|
188
km/h
|
171.3328
ft/s
|
190
km/h
|
173.15549
ft/s
|
192
km/h
|
174.97817
ft/s
|
194
km/h
|
176.80086
ft/s
|
196
km/h
|
178.62355
ft/s
|
198
km/h
|
180.44624
ft/s
|
200
km/h
|
182.26893
ft/s
|
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