question_answer

A person travels along a straight for the first half length with a velocity \[{{\upsilon }_{1}}\] and the second half length with a velocity \[{{\upsilon }_{2}}\] mean velocity \[\upsilon \]is given by

A)  \[\upsilon =\frac{{{\upsilon }_{1}}+{{\upsilon }_{2}}}{2}\]                            

B)  \[\frac{2}{\upsilon }=\frac{1}{{{\upsilon }_{1}}}=\frac{1}{{{\upsilon }_{2}}}\]        

C)  \[\upsilon =\sqrt{{{\upsilon }_{1}}{{\upsilon }_{2}}}\]                    

D)  \[\upsilon =\sqrt{\frac{{{\upsilon }_{2}}}{{{\upsilon }_{1}}}}\]