A spring is hanging down from the ceiling has an object of mass m is attached to the free end of the spring. The object is pulled down, released, and allowed to oscillate. T, the time required for one complete up-and-down oscillation, is given by the equation T = 2p(m/k)1/2. What is the unit for k, the spring constant, if the unit for T is tocks, and the unit for m is slugs?