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F.
2.Water clocks worked better than sundials because they told the time at night as well as during the day. They were also more accurate; however, since the rate of flow of water is very difficult to control accurately, a clock based on that flow can never really achieve excellent accuracy.
4. Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a given amount of time, while a slow-moving object covers a relatively small amount of distance in the same amount of time.
The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour.
SI unit: m/s, m s−1
Dimension: L T−1
Common symbols: v
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