速度是相对于参考框架的对象位置的变化速率。它以每次距离的单位（例如每秒米（m/s））进行测量。
1 mph = 0.489 yd/s
1 yd/s = 2.045 mph
例子:
将15 每小时英里转换为每秒院子：
15 mph = 7.333 yd/s
| 每小时英里 | 每秒院子 |
|---|---|
| 0.01 mph | 0.005 yd/s |
| 0.1 mph | 0.049 yd/s |
| 1 mph | 0.489 yd/s |
| 2 mph | 0.978 yd/s |
| 3 mph | 1.467 yd/s |
| 5 mph | 2.444 yd/s |
| 10 mph | 4.889 yd/s |
| 20 mph | 9.778 yd/s |
| 30 mph | 14.667 yd/s |
| 40 mph | 19.556 yd/s |
| 50 mph | 24.444 yd/s |
| 60 mph | 29.333 yd/s |
| 70 mph | 34.222 yd/s |
| 80 mph | 39.111 yd/s |
| 90 mph | 44 yd/s |
| 100 mph | 48.889 yd/s |
| 250 mph | 122.222 yd/s |
| 500 mph | 244.444 yd/s |
| 750 mph | 366.667 yd/s |
| 1000 mph | 488.889 yd/s |
| 10000 mph | 4,888.889 yd/s |
| 100000 mph | 48,888.889 yd/s |
规则