To solve this problem, we will first apply the concepts related to trigonometric relations and then the conservation of energy. By the trigonometric relations we will find the height for the calculation of the potential energy. For the conservation of energy we will give the relationship between the kinetic energy and initial potential with the final kinetic energy. Therefore, first the height by trigonometric relation we have



Then by conservation of energy


Here,
m = mass
g = Gravitational acceleration
v = Velocity
Rearranging to find the final velocity,



Therefore the correct answer is D.