From an inclined plane two particles are projected with same speed at same angle θ, one up and other down the plane as shown in figure. Which of the following statement(s) is/are correct?

Component of velocity of projection of each particle perpendicular to the inclined plane =u sin θComponent of g perpendicular to the inclined plane = g cosθTherefore in a direction perpendicular to the inclined plane , 0 = (u sin θ) T - 12g cos  θT2 = 0  ⇒T =2u sin  θg cos θ