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A spring with force constant equal to 120N/m is standing vertically. A mass equal to 0.300kg...

A spring with force constant equal to 120N/m is standing vertically. A mass equal to 0.300kg is dropped onto the spring from a height of 2.0m above the uncompressed end of the spring. How far is the spring compressed when the mass and end of the spring come to rest? (I think you need to use Energy of conservation formula)

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