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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

Four smooth steel balls of equal mass at rest are free to move along a straight line without friction. The first ball is given a velocity of 0.4 ms⁻¹. It collides head on with the second ball elastically, the second one similarly with the third and so on. The velocity of the last ball is [UP SEE 2004]

Answer: (A)

Solution

For equal-mass elastic collisions, each ball completely transfers its velocity to the next one it strikes (like a

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Question ID VK-153681