I think its doing around 15 km/sec. Thats moving pretty quick.
But it's not uncommon for meteorites to hit us with a relative speed of 150 km/sec or more. The Arizona crater was formed by a sliver approximately the size of a cruise ship. This new object is traveling in an orbit that is similar to the Earth's own orbit. This means a low relative speed, and also that it will be relatively easy for Bruce Willis to soft-land on it and drill holes.