Answer:
The period of oscillation is 2.01 s
Step-by-step explanation:
Given;
mass of the attached ball, m = 500 g
length of the string, L = 1 m
The period of oscillation of a conical pendulum is given as;

θ = 0, since the mass is allowed to moved in horizontal direction

Therefore, the period of oscillation is 2.01 s