What concepts are involved here? 93. A particle of mass m moves in the potential shown here. The period of the motion when the particle has energy E is The potential is V = 1/2kx^2 for x <0 and V= mgx for x > 0. A. Sqrt[k/m] B. 2*pi*Sqrt[m/k] c . 2*Sqrt[2E/(mg^2)] D. pi*Sqrt[m/k] + 2*Sqrt[2*E/(m*g^2)] E. 2*pi*Sqrt[m/k] + 4*Sqrt[2*E/(mg^2)] The answer is D.