University Physics

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A 8.3-g bullet, when fired from a gun into a 1.1-kg block of wood held in a vise, penetrates the block to a depth of 7.05cm. This block of wood is next placed on a frictionless horizontal surface, and a second 8.3-g bullet is fired from the gun into the block. To what depth (in cm) will the bullet penetrate the block in this case?

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