Consider a mass m with a prestressed pull spring on either end, each attached to a wall. Let k1 and k2 be the pull spring constants of the springs. A displacement of the mass by a distance x results in the first spring k1 lengthening by a distance x(and pulling in the - direction), while the second spring k2 is abbreviating by a distance x (and pulls in the positive direction). The equation of motion then becomes: Three questions: 1. Is it correct that 2. If the answer on question (1) is yes, what is ω if k2>k1 3. Is is possible to resonate with a force F=A.cos(ωt) en what would be the amplitude of this force.