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@moth
54,000 km/h / 60x60 s/h = 15 km/s
KE = 1/2 m v^2 = 1,125,000,000,000 J, equivalent to 269 Tonnes of TNT in the usual measure of explosions. i.e. only a little more than a quarter kiloton, about equal the smallest nuke in the US arsenal.
Interestingly, would have got upto 11.2 km/s of its velocity from falling into the Earth's gravitational field, so would have been wandering through space at less than 4 km/s - too slow for it to have come from very far out in the solar system.