A ball is thrown straight upward. You are given its initial velocity u, the acceleration due to gravity g (taken as −9.8m/s2) and the time of flight t. You wish to calculate its displacement s at that time without first finding its final velocity. Which of the following kinematic relations is the most direct choice?
(a) s=vt+21gt2
(b) s=ut−21gt2
(c) s=ut+21gt2
(d) s=(u+v)t