Problem at an amusement park a swimmer uses a water slide, Ask an Expert

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Problem: At an amusement park, a swimmer uses a water slide to enter the main pool. The swimmer slides without friction, and descends through a vertical height of 2.38m.

Part A: Find the swimmer's speed at the bottom of the slide if she starts with an initial speed of 0.820m/s.

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

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