Circular Motion - Pendulum Question .HELP

[Goalie1]

Circular Motion - Pendulum Question...HELP!

1. A pendulum 80.0 cm long is pulled to the side, so that its bob is raised 20.0 cm from its lowest position, and is then released. As the 50.0 g bob moves through its lowest position, (a) what is its speed and (b) what is the tension in the pedulum cord?



2.(a) what is its speed and (b) what is the tension in the pedulum cord?



3. Ans. (a) 1.98 m/s (b) 0.735 N
I think it is a two part question but I am drawing a total blank and can't figure out how to do this problem.
PLEASE HELP!
Thanks

 

[Goalie1]

Can somebody please point me in the right direction...If someone can just give me the formulas I should be able to figure it out from there.

 

[Adeleine]

Try and think about this a bit more... What unit are you learning right now? That should give a clue on what to do.