7. A 2.00-kg particle with a speed of 10.0 m/s undergoes a glancing collision with a 3.00-kg particle initially at rest. After the collision, the 2.00-kg particle is traveling at an angle of 90.0° from its original direction of motion and the 3.00- kg particle has a speed of 4.00 m/s. Find the speed of the 2.00-kg particle after the collision.

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