In a projectile motion let tOA=t1 and tAB=t2. The horizontal displacement from O to A is R1 and from A to B is R2. Maximum height is Hand time of flight is T. If air drag is to be considered, then choose the correct alternative(s).

In the upward journey resistance due to air will be in downward direction. While in downward motion resistance will be upwards. Therefore, t1 will decrease, while t2 will increase. Hence, T = t1 + t2 may increase or decrease. H will decrease. In horizontal direction air resistance is opposite to the motion. Therefore, R1 will decrease while R2 may decrease or increase.