Expression of conservation of mechanical energy:

$\overline{){{\mathbf{K}}}_{{\mathbf{i}}}{\mathbf{+}}{{\mathbf{U}}}_{{\mathbf{i}}}{\mathbf{+}}{{\mathbf{W}}}_{{\mathbf{NC}}}{\mathbf{=}}{{\mathbf{K}}}_{{\mathbf{f}}}{\mathbf{+}}{{\mathbf{U}}}_{{\mathbf{f}}}}$

Two meteoroids are heading for earth. Their speeds as they cross the moon's orbit are 2.0 km/s.

A) The first meteoroid is heading straight for earth. What is its speed of impact?

(B) The second misses the earth by 4500 km. What is its speed at its closest point?

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