One fine day a Norse god, Loki assembled an asteriod resembled Chicxulub impactor using numerous Lego® bricks(the same one we have on Earth) in Jupiter's orbit. He wanted to duplicate the event that triggered the extinction of the dinosaurs so he hurl the Lego asteriod towards Earth at approximately 20Km/s and do not worry I am not asking how many bricks is needed to assemble such an asteroid. Using the same parameters as the Chicxulub impactor except it is assembled with plastic Lego® bricks instead, how can we prevent a catastrophic calamity?
P.S Loki maybe mean but he will not try to intervene with our defenses and we have been keeping a close watch at Loki while he is busy playing with the Lego® bricks. Also please do not tell me this asteriod will disintegrate enroute to Earth, in that case kindly provide guidance to Loki so that he can become master builder in exchange for your own safety. (Loki will applaud answer that contains mathematic and advise whether does he really need superglue not to be mistaken with "Kragle".)
- Size: 12000m (diameter)
- Velocity: 20000m/s
- Location of impact: Chicxulub
- Impact angle: 90°
Comment below if you have doubt.