In kinematics, the speed of an object is the magnitude of its velocity; it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.
All stories in Speed
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Tesla driver arrested for flossing at 84 mph on autopilot
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Oyama CX E8D II Review: This folding e-bike gets almost everything right
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Apple launches the 16-inch MacBook Pro and, yes, it has a 'new' keyboard
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An engineer explains how supercharged racing yachts go so fast
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Review: The $1,299 RadRunner is part cargo e-bike, part moped, and all fun
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This adult cam site is handing out virtual blowjobs, free of charge
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Obsessing over first-page load time sabotages ecommerce businesses
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