A particle \( A \) suffers an oblique elastic collision with a particle \( B \) that is at rest ...

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A particle \( A \) suffers an oblique elastic collision with a particle \( B \) that is at rest initially. If their masses are the same, then after the collision
(1) their KE may be equal
(2) \( A \) continues to move in the original direction while \( B \) remains at rest
(3) they will move in mutually perpendicular directions
(4) \( A \) comes to rest and \( B \) starts moving in the direction of the original motion of \( A \)
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