Two balls are thrown from an inclined plane at angle of projection `alpha` with the plane, one up the incline and other down the incline as shown in figure (`T` stands for total time of flight):
A. `h_(1)=h_(2)=(v_(0)^(2)sin^(2)alpha)/(2g cos theta)`
B. `T_(1)=T_(2)=(2v_(0)sin alpha)/(g cos theta)`
C. `R_(2)-R_(1)=g(sin theta)T_(1)^(2)`
D. `v_(1)=v_(2)`