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turchin comments on Artificial explosion of the Sun: a new x-risk? - Less Wrong
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I think that the comet would desintegrate quicker than with speed of sound, and more like with the speed of incoming gases that is 600 km/sec, so it would be destroed in less than 1 second. Comet is not asteroid - it is very fragile and it will start to desinegrate even before the impact bacuse of gravitational forces - it will be inside Roshe limit of Sun and tidal forses will start to elongate it.
The mass of whatever the impactor is has to be brought to a halt and for a 100 km chunk massing as much as you've computed, that's not happening in an instant in the photosphere of the Sun. Computing exactly how long is a non trivial task and at that speed is more like the injection of a supersonic fluid through a much lower density medium since the internal strength, heat capacity and even the ionization energy of the object is trivial against the kinetic energy it is dissipating.