question_answer

A body goes from P to Q with a velocity of 40\[m{{s}^{-1}}\]and comes back from Q to P with a velocity of 60\[m{{s}^{-1}}\]. Then the average velocity for the whole journey is

A)  50 \[m{{s}^{-1}}\]                          

B)  48\[m{{s}^{-1}}\]

C)  42 \[m{{s}^{-1}}\]                          

D)  Zero