Finding An Initial Speed, Intro to Physics Question

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To find the initial speed of a coin tossed to a height of 2.8 m from a starting height of 1.2 m, the appropriate equations of motion or conservation of energy can be applied. The acceleration due to gravity is assumed to be -9.8 m/s². Using the conservation of energy method simplifies the calculation, as it relates potential energy at the peak to kinetic energy at the start. The discussion emphasizes the importance of understanding both methods for solving physics problems. A clear grasp of these concepts is essential for accurately determining initial speed.
STEF2098
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A boy tosses a coin straight up to 2.8 m. Suppose the height when the coin leaves his hand is 1.2 m. What was the initial speed of the coin when it left his hand?

I'm just confused as to what equation to use. And I don't know whether to assume the acceleration is -9.8 m/s^2. Thanks.
 
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You can do this either with forces, or with conservation of energy. The conservation of energy method is much simpler, but I'm not sure if you've learned it yet.
 
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