can someone please guide/ show me how to do this question, ?
thanks
It is impossible to do that without knowing $\displaystyle v_1$, $\displaystyle v_2$, $\displaystyle v_1*$, and $\displaystyle v_2*$ mean! We might guess that $\displaystyle v_1$ and $\displaystyle v_2$ are the speeds of the two objects but that should be given in the problem.