Aparticle of mass m slides down, under gravity, a smooth ramp which is inclined at angle θ to the horizontal. at the bottom, it is joined smoothly to a similar ramp rising at the same angle θ to the horizontal to form a v-shaped surface. if the particle slides smoothly around the join, determine the period of oscillation, t, in terms of the initial horizontal displacement x from the centre join. note the shape of the potential well.