A 2 kg mass is attached to one end (labeled A) of a weightless spring whose other end (labeled B) is fixed. The spring has an u length of 1.5m and a stiffness constant, i.e. modulus of elasticity, of 12N. Initially, point B remains at rest, and the mass hangs in its equilibrium position. Beginning at time \(t = 0V), point B starts oscillating in such a way that its vertical displacement belov rest position is given by \(5|sin(2t)V) meters, with \(tl) measured in seconds. At a general time \(tl), let \(x)) (in meters) denote ti the spring from its natural length, and let |(y)) (in meters) represent the mass's displacement below its initial location. The moti in the absence of any air resistance. Express \(y V) in terms of \(tV).