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It describes how quickly or slowly an object moves from one place to another. The standard (SI) unit of speed is meters per second (m/s), but it can also be expressed in other units, such as kilometers per hour (km/h), miles per hour (mph), or feet per second (ft/s), depending on the context or the country's measurement system.
- Speed and Velocity
- Speed
- Units
- Average vs Instantaneous Speed
- Constant Speed
- Velocity
- Relative
Speed is how fast something moves. Velocity is speed with a direction. Saying Ariel the Dog runs at 9 km/h(kilometers per hour) is a speed. But saying he runs 9 km/h Westwardsis a velocity. Imagine something moving back and forth very fast: it has a high speed, but a low (or zero) velocity.
Speed is measured as distance moved over time. Speed = Distance Time We can also use these symbols: Speed = Δs Δt Where Δ ("Delta") means "change in", and 1. smeans distance ("s" for "space") 2. tmeans time
Speed is commonly measured in: 1. meters per second (m/s or m s-1), or 2. kilometers per hour (km/h or km h-1) A km is 1000 m, and there are 3600 seconds in an hour, so we can convert like this (see Unit Conversion Methodto learn more): So 1 m/s is equal to 3.6 km/h
The examples so far calculate average speed: how far something travels over a period of time. But speed can change as time goes by. A car can go faster and slower, maybe even stop at lights. So there is also instantaneous speed: the speed at an instantin time. We can try to measure it by using a very short span of time (the shorter the better).
When the speed does not change it is constant. For constant speed, the average and instantaneous speeds are the same.
Velocity is speed with a direction. It is actually a vector ... ... as it has magnitude anddirection Because the direction is important velocity uses displacementinstead of distance: Speed = Distance Time Velocity = Displacement Time in a direction. Learn more at Vectors.
Motion is relative. When we say something is "at rest" or "moving at 4 m/s" we forget to say "in relation to me" or "in relation to the ground", etc. Think about this: are you really standing still? You are on planet Earth which is spinning at 40,075 km per day (about 1675 km/h or 465 m/s), and moving around the Sun at about 100,000 km/h, which is ...
Apr 18, 2024 · velocity change = 6.95 × 4 = 27.8 m/s. Since the initial velocity was zero, the final velocity is equal to the change in speed. You can convert units to km/h by multiplying the result by 3.6: 27.8 × 3.6 ≈ 100 km/h. You can, of course, make your calculations much easier by using the average velocity calculator.
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Aug 21, 2023 · for quick conversions. m/s × 2.237 = mi/h. Solution. To convert m/s to mi/h, use the conversion factor. 1 m/s = 2.23693629 mi/h. Then divide both sides of the equation by m/s, to get the conversion ratio. 1 = 2.23693629 mi/h / m/s. Using the conversion ratio to complete the unit conversion, basically multiplying the input by 1, the m/s units ...
Mar 27, 2019 · 1 Meter per hour [m/h] = 1 m/h ≈ 2.77778 x 10-4 m/s : 1 Meter per day [m/day] = 1 m/day ≈ 1.15741 x 10-5 m/s: 1 Meter per year [m/year] = 1 m/year ≈ 3.1688 x 10-8 m/s: 1 Kilometer per second [km/s] = 1 km/s = 1000 m/s = 3600 km/h ≈ 2236.9 mph: 1 Kilometer per hour [km/h] = 1 km/h = 1.609344 mph ≈ 0.27778 m/s ≈ 0.91134 ft/s
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Example 5: The driver of a maruti car driving at the speed of 68 km/h locates a bus 40 metres ahead of him. After 10 seconds, the bus is 60 metres behind. The speed of the bus is. 30 km/h; 32 km/h; 25 km/h; 38 km/h; Solution: (2) Let speed of Bus = SB km/h. Now, in 10 sec., car covers the relative distance = (60 + 40) m = 100 m. ∴ Relative ...
