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A 1.42 kg block is attached to a horizontal spring with spring constant 3100 N/m ....

A 1.42 kg block is attached to a horizontal spring with spring constant 3100 N/m . The block is at rest on a frictionless surface. A 8.40 g bullet is fired into the block, in the face opposite the spring, and sticks.

Part A

What was the bullet's speed if the subsequent oscillations have an amplitude of 14.3 cm ?
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