Question a rifle bullet with a muzzle speed of 340ms is, Ask an Expert

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Question: A rifle bullet with a muzzle speed of 340m/s is fired directly into a special dense material that stops the bullet in 22.0 cm.

Part A: Assuming the bullet's deceleration to be constant, what is its magnitude?

I know the correct answer for above problem but explain how to get this answer! Thanks.

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