projectile of mass 30 grammes travels horizontally at velocity V. It embeds itself  in a stationary sand bag of mass 10 kg which is suspended on a rope. The centre of  mass of the bag is 1.2 m below the point of suspension. After being struck, the bag  swings freely through an arc of 30o . By use of potential and kinetic energy as well as  momentum theory determine the velocity V and kinetic energy lost in the impact

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