What is the tension in the string?

A 100kg steel ball hags at a lower end of a vertical string, 50 cm below a fixed point of suspension. A) with the ball hanging at rest, what is the tension in the string? B) If the ball is swinging as a simple pendulum so it pes through the lowest point as it swings at 1m/s, what is its acceleration(magnitude and direction) at this point? C) What is the tension in the string as the ball swings through the lowest point?