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Which of the following can be used to describe how fast an object is moving along with the direction of motion at a given instant of time?(a) Instantaneous velocity(b) Instantaneous speed(c) Average velocity(d) Average speedThis question was posed to me in a national level competition.This interesting question is from Straight Line Motion topic in chapter Motion in a Straight Line of Physics – Class 11

Answer»

Correct answer is (a) Instantaneous velocity

The best I can explain: Instantaneous velocity describes the velocity of an object at a given TIME instant. Average speed is the speed at which the object travels throughout the time PERIOD and not an instant. Speed is a scalar QUANTITY; hence it cannot show the DIRECTION of motion.



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