NEET2018PhysicsWork, Power and EnergyActual
A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter A B = D . The height h is equal to,
Options
- A7 5 D
- BD
- C3 2 D
- D5 4 D
Correct answer
D. 5 4 D
Step-by-step solution
To just complete a vertical circle, speed at A should be v A = 5 g R Using energy conservation m g h = 1 2 m v A 2 h = 1 2 v A 2 g = 1 2 5 g g D 2 R = D 2 h = 5 D 4