Column-I shows different constrained motions in a vertical plane. Match each situation with the applicable statement(s) about constraint force, acceleration or completion of the circular path.

List 1

1. (A) Particle projected inside smooth tube with v₀=√(4gR).

   

2. (B) Bob constrained by a string with v₀=√(2gR).

   

3. (C) Bob constrained by a rod with v₀=√(3gR).

   

4. (D) Small block projected inside spherical surface with v₀=√(8gR).

   

List 2

1. (P) Constraint force may point radially outward during motion.

2. (Q) At some instant acceleration is purely centripetal.

3. (R) Tangential acceleration decreases speed for the entire motion.

4. (S) Particle completes the circular path.