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(D) In a one-dimensional elastic collision between two bodies of equal mass,where one body is initially at rest,the velocities of the two bodies are i

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$A$ comes to rest and $B$ moves with the velocity of $A$.

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(D) In a one-dimensional elastic collision between two bodies of equal mass,where one body is initially at rest,the velocities of the two bodies are interchanged after the collision.Since bob $A$ and bob $B$ have the same mass $(m_A = m_B = m)$ and the collision is elastic,bob $A$ (which has velocity $v$ just before the collision) will come to rest after the collision.Simultaneously,bob $B$ (which was initially at rest) will acquire the velocity $v$ that bob $A$ had just before the collision.Therefore,$A$ comes to rest and $B$ moves with the velocity of $A$.

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

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