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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

Four smooth steel balls of equal mass are at rest and free to move along a straight line without friction. The first ball is given a velocity of 0.4 m/s. It collides head-on elastically with the second, the second one similarly with the third, and so on. The velocity of the last ball is

Answer: (A)

Solution

In each elastic collision between equal masses, the moving ball's entire velocity is transferred to the next ball, which was at

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Question ID VK-154037