Homework Help: Physics plz help

Posted by Ally on Monday, June 25, 2012 at 12:27am.

(a) What is the energy of a pendulum (L = 0.9 m, m = 0.4 kg) oscillating with an amplitude of 4.3 cm?

(b) The pendulum's energy loss (due to damping) is replaced in a clock by allowing a 2.3-kg mass to drop 1.0 m in 1 week. What percentage of the pendulum's energy is lost during one cycle?
%

Please someone help me out i am stuck

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