At position 3 the pendulum has increased its vertical height by 60cm from positi

At position 3 the pendulum has increased its vertical height by 60cm from positi

At position 3 the pendulum has increased its vertical height by 60cm from position 2. This increases the gravitational potential energy by 2.2KJ. The gravitational field strength on earth is 9.81 N/kg.
Calculate the mass of the pendulum.