A small sphere of mass m is attached to one end of a light string of length L with the other end of the string attached to a fixed point. The ball is moving at a constant speed v in a horizontal circle of radius r such that the string makes an angle θ with the vertical. Given that the tension in the string is T, what is the correct expression for the object's speed v?
a. v=mTLsinθ b. v=Lgsinθ c. v=mgTL
d. v=TLmg e. v=mg2TL