Question

Q. You are sitting by the side of a country road, and a car comes speeding along. Suddenly it stops in front of you for just a second,

then speeds off again in the same direction, going faster and faster as it disappears from view. Which of the following is true regarding the car's motion?

A. Its instantaneous velocity changed direction during its motion.

B. Its average speed during the motion was equal to zero.

C. Its average speed was never equal to zero.

D. Its instantaneous speed was never equal to zero.

Answer 1

C) Its average speed was never equal to zero. - ''correct statement''.

it is so because , average speed is given by total distance travelled by total time during the journey .

Mathematically , average speed = total ditance/ total time

Now , since total distance is not equal to zero , therefore average speed is not zero through out the journey.

Whereas the other statements given is incorrect because instantaneous velocity never changed their direction , also instantaneous speed is zero when the care came to a stop for 1 second.

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