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)`
`v(t) = v(0) + at`
d) `a_("average") = [v(t_(2))-v(t_(1))/[t_(2)-t_(1))`
The average stands for average of the quantity over time interval `t_(1)` to t_(2)`

Answer

(b) and (e )