Question

For a particle journey the magnitude of average velocity is 20m/s . which among the following cannot be the value of average speed
options 1. 24m/s
2. 15m/s
3.20m/s
4. 31 m/s​

Answer 1

Answer:

2. 15m/s

Explanation:

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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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