For any arbitrary motion in space , which of the following relations are true : (a) `V_("average")=(1//2)(v(t_(1))+v(t_(2)))`
(b) `V_("average")=[r(t_(2))-r(t_(1))]//(t_(2)-t_(1))`
(c ) `V(t)=V(0)+at`
(d) `r(t) =r(0)+v(0)T+(1//2)at^(2)`
(e ) `a_("average")=[v(t_(2))-v(t_(1))]//(t_(2)-t_(1))`
(The average stands for average of the quantity over the time interval `t_(1)" to "t_(2))`

Answer

(b) and (e )