The current theory of the srtucture of the Earth, called pate tectonics , tells us that the continents are in constant motion. Assume that the North American continent can be reoresented by a slab of rock 5450 km on a side and 36 km deep and that the rock has an average mass density of 2790 kg/m^3. The continent in moving at the rate of about 3.2 cm/year. Part 1) What is the mass of the continent? Answer in untis of kg. Part 2) What is the kenetic energy of the continent? Answer in units of J. Part 3) A jogger (of a mass 79 kg) has the same kenetic energy as that of the continent. What would hos speed be? Answer in units of m/s.