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velocity |
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velocitySpeed of an object in a given direction, or how fast an object changes its position in a given direction. Velocity is a vector quantity, since its direction is important as well as its magnitude (or speed). For example, a car could have a speed of 48 kph/30 mph and a velocity of 48 kph/30 mph northwards. Velocity = change in position/time taken. The velocity at any instant of a particle travelling in a curved path is in the direction of the tangent to the path at the instant considered. The velocity v of an object travelling in a fixed direction may be calculated by dividing the distance s it has travelled by the time t taken to do so, and may be expressed as: |
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? Mentioned in | ? References in periodicals archive | ||
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| Virgin Trains has achieved a new train speed record on the 401-mile route from Glasgow - London with a nonstop journey time of three hours and 55 minutes - an impressive average speed of 102. By comparison, humans walk at an average speed of 4. The main reason for the nearly annual adjustment we need now is a mismatch between the definition of the second in terms of atomic time and that in terms of the average speed of the Earth's rotation. |
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Average speed