In a projectile motion let `t_(OA)=t_(1)` and `t_(AB)=t_(2)`.The horizontal displacement from `O` to `A` is `R_(1)` and from `A` to `B` is `R_(2)`.Maximum height is `H` and time of flight is `T`.If air drag is to be considered, then choose the correct alternative(s).

Options

A. `t_(1)` will decrease while `t_(2)` will increase
B. `H` will increase
C. `R_(1)` will decrease while `R_(2)` will increase
D. `T` may increase or decrease

Answer

A, D

Explanation

In the upward journey resistance due to air will be in downward direction.While in downward motion resistance will be upwards.Therefore, `t_(1)` will decrease, while `t_(2)` will increase.Hence, `T=t_(1)+t_(2)` may increase or decrease.`H` will decrease.In horizontal direction air resistance is opposite to the motion.Therefore, `R_(1)` will decrease while `R_(2)` may decrease or increase.