Question

For a particle’s journey, the magnitude of average

velocity is 20 m/s. Which among the following

cannot be the value of average speed?

(1) 24 m/s

(2) 15 m/s

(3) 20 m/s

(4) 31 m/s​

Answer 1

Answer:

option b

Explanation:

15 m/s.

all the best.

Answer 2

Given : For a particle’s journey, the magnitude of average  velocity is 20 m/s

To Find :  Which among the following  cannot be the value of average speed?

Solution:

Average Velocity =  Total Displacement / Total Time

=> 20 =  Total Displacement / T

=> Total Displacement  = 20T

Average Speed =  Total Distance / Total Time

Displacement  is the minimum Distance  

Hence Displacement  ≤ Distance  

=>  20T  ≤ Distance  

Hence Average Speed  ≥ 20T / T

=> Average Speed  ≥  20 m/s

Hence 15 m/s can not be the value of average speed  

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