The subject of the folulae, `s=ut+(at^(2))/(2)` is____

The number of variables in the formula S=ut+ (at^(2))/(2) is__.

Check the correctness of the formula S=ut+1/3at^(2) where S is the distance , u is velocity , a is acceleration and t is time .

Check the correctness of the formula S = ut + 1/3 "at"^2 where S is the distance , u is velocity , a is acceleration and t is time.

Check the correctness of the formula S = ut + 1/3 "at"^2 where S is the distance , u is velocity , a is acceleration and t is time.

Check the accuracy of the relation s = ut + (1)/(2)at^(2) where s is the distance travelled by the with uniform acceleration a in time t and having initial velocity u.

Check the correctness of the equations (i) s=ut+1/2at^(2) (ii) v^(2)=u^(2)+2as using dimensions.