The bob of mass m of a conical pendulum of length l = 2 m rotates in a circle while the string makes an angle of 25∘ with the vertical. a. Draw the free body diagram for the mass m. b. Determine period of the pendulum. a. 8.1 s b. 0.56 s c. 1.03 s d. 2.7 s e. 0.81 s