In the stellar gravitational collapse of a star of mass \(12 M_{\odot}\) all mass (minus that which remains concentrated in the neutron star) is ejected from the explosion with velocity \(v \sim 10^{-2} c\) (Fig. 13.3). Determine the total kinetic energy that competes with the matter in the system after the explosion, and compare the value with (13.17).

Fig. 13.3 

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SN-remnant Cassiopeia A X-ray (CHANDRA, green-blue); optical (HST, yellow); JR (SST, red)