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Statement of a problem № 172

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Particle 1 moving with velocity v = 10 m/s experienced a head-on collision with a stationary particle 2 of the same mass. As a result of the collision, the kinetic energy of the system decreased by η = 1.0%. Find the magnitude and direction of the velocity of particle 1 after the collision.

Solution:
Particle 1 moving with velocity v = 10 m/s experienced a head-on collision with

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