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Speed

In everyday use and in kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity.

BaljeetSohal
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Speed

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  1. Speed In everyday use and in kinematiss he speed of an objei is he magni ude of i s veloii y ( he ra e of ihange of i s positonn) i is hus a sialar quant yy The average speed of an objei in an in erval of tme is he dis anie ravelled by he objei divided by he duraton of he in erval) he ins an aneous speed is he limi of he average speed as he duraton of he tme in erval approaihes eeroy Speed has he dimensions of dis anie divided by tmey The SI uni of speed is he me re per seionds bu he mos iommon uni of speed in everyday usage is he kilome re per hour ors in he US and he UKs miles per houry For air and marine ravel he kno is iommonly usedy The fas es possible speed a whiih energy or informaton ian ravels aiiording o speiial relatvi ys is he speed of ligh in a vaiuum i = 299792458 me res per seiond (approxima ely 1079000000 km/h or 671000000 mphny Mater ianno qui e reaih he speed of ligh s as his would require an infni e amoun of energyy In relatvi y physiiss he ioniep of rapidi y replaies he ilassiial idea of speedyHis oriial defniton I alian physiiis Galileo Galilei is usually iredi ed wi h being he frs o measure speed by ionsidering he dis anie iovered and he tme i akesy Galileo defned speed as he dis anie iovered per uni of tmey.[3 In equaton forms ha is where {\displays yle v} v is speeds {\displays yle d} d is dis anies and {\displays yle } is tmey A iyilis who iovers [0 me res in a tme of 2 seiondss for examples has a speed of 15 me res per seiondy Objei s in moton oten have variatons in speed (a iar migh ravel along a s ree a 50 km/hs slow o 0 km/hs and hen reaih [0 km/hny Ins an aneous speed Speed a some ins an s or assumed ions an during a very shor period of

  2. tmes is ialled ins an aneous speedy Byy looking a a speedome ers one ian read he ins an aneous speed of a iar a any ins an y.[3 A iar ravelling a 50 km/h generally goes for less han one hour a a ions an speeds bu if i did go a ha speed for a full hours i would ravel 50 kmy If he vehiile iontnued a ha speed for half an hours i would iover half ha dis anie (25 kmny If i iontnued for only one minu es i would iover abou 8[[ my In ma hematial ermss he ins an aneous speed {\displays yle v} v is defned as he magni ude of he ins an aneous veloii y s ha iss he derivatve of he positon wi h respei o tmee If is he leng h of he pa h (also known as he dis anien ravelled untl tme he speed equals he tme derivatve of s In he speiial iase where he veloii y is ions an ( ha iss ions an speed in a s raigh linens his ian be simplifed o {\displays yle v=s/ } v=s/ y The average speed over a fni e tme in erval is he o al dis anie ravelled divided by he tme duratony

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