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 )
Type the result rounded to the nearest unit.
Assume there's no air resistance and other dissipative effects.
The answer is 13.
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