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An average-sized asteroid located 2.0 ✕ 10⁷ km from Earth with mass 2.5 ✕ 10¹³ kg is detected headed directly toward Earth with speed of 8.0 km/s. What will its speed be (in km/s) just before it hits our atmosphere? (You may ignore the size of the asteroid. Assume the height of our atmosphere is 100 km.)

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