JEE Main Physics question
A bob of mass , attached to an inextensible string of length , is given a horizontal velocity at the lowest point equal to the minimum speed required to just complete a full vertical circle. The bob swings up, and at some angle (measured from the lowest point) its speed becomes exactly half of its speed at the lowest point. The angle satisfies **[IIT JEE 2008]**
Answer: (D)
Solution
The minimum speed to complete the loop is . At angle from the lowest point, height risen is , so energy conservation gives .
See the full step-by-step solution
Create a free account to read the complete working, and practise questions like this in a timed test.
Create a free account