Question

The bob $A$ of a simple pendulum is released when the string makes an angle of $45^{\circ}$ with the vertical. It hits an other bob $B$ of the same material and same mass kept at rest on the table. If the collision is elastic

• A. both $A$ and $B$ rise to the same height
• B. both $A$ and $B$ come to rest at $B$
• C. both $A$ and $6$ move with the same velocity of $A$
• D. A comes to rest and $6$ moves with the velocity of $A$

Answer 1

Answer: (D)

Since, collision is elastic hence, velocities of bobs $A$ and $B$ get interchanged.
Thus, $A$ will come to rest and $B$ will move with the velocity of $A$.