[" The potential energy of a particle "(U_(x))" executing S.H.M.is "],[" given by "],[[" (a) "U_(x)=(k)/(2)(x-a)^(2)," (b) "U_(x)=k_(1)x+k_(2)x^(2)+k_(3)x^(3)],[" (c) "U_(x)=Ae^(-bx)," (d) "U_(x)=" a constant "]]