A pendulum 80.0 cm long is pulled to the side so that its bob is raised 20.0

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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 pendulum cord?

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