Kinematics

Ans.d

@IshittaU a and c are kinematical equations which hold true only when a is constant. This is not the given case (a varies with time) and so these optns r wrong
C & d are fundamental eqns but in c the position vectors need the be subtracted not added hence c is wrong
D is the right fundamental eqn and holds true under any condition
There is a similar question in ncert