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a ballistic pendelum has a mass of m=150g. a metal ball projectile m=60g is shot into...

a ballistic pendelum has a mass of m=150g. a metal ball projectile m=60g is shot into the pendelum. one initial keeping of the bottom of the pendelum from the table top is 2cm. the pendelum swings upward to a height of 9cm from the table. engagged with a nitch rock and comes to rest. taking g=9.8m/s^2, finf the initical speed of the projectile ball.
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