The Meteorite

An object of mass 10kg, composed by rock and ice, enters Earth atmosphere at 10km/s. At instant A, vaporized ice is released by a jet at 15km/s ( 30 degrees relative to horizontal). In this process the object loses 20% of mass. Both values are measured relatively to the observer.

What's the speed [km/s] of the object immediatly before the impact with the surface? (instant B)

\(g=9,8m/s^{2}\)

Type the result rounded to the nearest unit.

Assume there's no air resistance and other dissipative effects.

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