The net force on the bob at the mean position is ?

Question

A simple pendulum of length of 5m, with a bob of mass 1kg, is in simple harmonic motion. As it passes through its mean position, the bob has a speed of 5m/s. The net force on the bob at the mean position is  

      (a) zero                      (b) 2.5 N

      (c) 5 N                         (d) 25 N

Answer 1

Given a simple pendulum with mass attatched to it