15 g bullet is fired at a 2.1 kg wooden block which is hung at the end of 1.35 m long strings as a ballistic pendulum. The bullet strikes the block and imbeds itself 10 cm into the block. The pendulum then swings up to an angle of 27.5 0 . What is the muzzle velocity of the bullet? How much energy is transformed to thermal energy by friction between the bullet and the block?

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