Question

A race finishes at the same place as it started. The contestants start from rest and cross the finish line running. Which one of the following is true about the average speed, the average velocity, and the average acceleration? Note that the symbol ≠ means "not equal to".
which one?
a. average speed = 0 m/s, average velocity ≠ 0 m/s, average acceleration = 0 m/s2

b. average speed ≠ 0 m/s, average velocity = 0 m/s, average acceleration ≠ 0 m/s2

c. average speed = 0 m/s, average velocity = 0 m/s, average acceleration = 0 m/s2

d. average speed ≠ 0 m/s, average velocity = 0 m/s, average acceleration = 0 m/s2

e. average speed ≠ 0 m/s, average velocity ≠ 0 m/s, average acceleration =0m/s^2

Answer 1

Answer:

b

Explanation:

 As we know that

Average velocity= Total displacement/Total time

  v=d/t

Average speed= Total distance/Total time

V=S/T

As we know that average acceleration given as

$a_{avg}=\dfrac{a_1t_1+a_2t_2}{t_1+t_2}$

Starting and finishing point is same for race,that means that it total displacement will be zero but total distance will not be zero.So we cam say that it average velocity will be zero but average speed will not be zero.It average acceleration will not be zero also.

So our option b is correct.