A bullet with mass 10gr is shot in a ballistic pendulum with mass 1.49kg until the pendulum move up and reach \( \theta \) degree ( \( \cos \theta = 0.75 \) ). If the length of the pendulum string is 0.4m, hence, what is the initial velocity of the bullet ? ( take *\( g = 9.8\frac{m}{s^{2}} \)* )

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