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The bob of a pendulum of length l is pulled aside from its equilibrium position through an angle  and then released. The bob will then pass through its equilibrium position with a speed v, where v equals

(a) 2gl(1-sinθ)

(b) 2gl(1+cosθ)

(c) 2gl(1-cosθ)

(d) 2gl(1+sinθ)