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5. A bullet with a mass 0.850 g is fired in to a hanging block which...

5. A bullet with a mass 0.850 g is fired in to a hanging block which is free to swing (recall ballistic pendulum). Mass of the hanging block is 6.4 kg. The bullet comes to rest as it is fired to the block and the block + bullet then swing upward vertically displacing the center of mass of the system by 7. 2 cm before the system comes momentarily to rest at the end of the arc. What is the speed of the bullet prior to the collision?

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Answer #1

Use the total energy conservation when the bullet moves with the velocity and when both the masses are at the displaced point.

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