Problem the speed of a bullet is measured to be 615 ms as, Ask an Expert

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Problem: The speed of a bullet is measured to be 615 m/s as the bullet emerges from a barrel of length 1.35 m. Assuming constant acceleration,

Part A- Find the time that the bullet spends in the barrel after it is fired.

I know the correct answer for above problem but explain how to find the time that the bullet spends in the barrel! Thanks.

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