Momentum of pendulum at its lowest point

[xpc123456789]

A pendulum of length L swings from rest at a starting angle of θ from the vertical. Assume the mass is concentrated at the end of the pendulum; find its momentum at its lowest point.

Please help, thx:)

 

[Simon Bridge]

Welcome to PF;
The idea is that you have a go to show us where you get stuck and then we can help.

From what you wrote I cannot tell what to help you with exactly - do you know what a pendulum is? What momentum is? Kinetic energy? Gravitational potential energy? Do you know the expressions for these?