Kathy Owns an Apartment Building on the Edge of a Densely-Populated

Kathy owns an apartment building on the edge of a densely-populated city.It has become dilapidated.It would be more expensive to renovate the existing building than to tear it down and rebuild,so she hires the Big Boom Demolition Company to implode the building.Kathy,who knows nothing about demolitions,simply tells Big Boom that she wants the demolition completed by August 1.She will be on vacation in Japan at the time,and will return on August 8.Mike,who has twenty-one years of demolition experience and is the manager of Big Boom,secured the proper governmental permits,and set the explosive charges.On August 1,at the time allowed in the permit,the explosives are detonated.Although barriers were set up keeping the public away for a radius of one-half mile in all directions,the debris scattered over a three-quarter mile radius,harming several people.This was because Mike used more dynamite than was necessary.What are the relationships of the parties,and who is liable for the injuries?