(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In the diagram I have attached the initial question is to find the total mechanical energy. however in the solutions which I have placed under the diagram, they don't use the mass (m). So total mechanical energy i thought was = mgh + 0.5m[itex]v^{2}[/itex] but they use gh + 0.5[itex]v^{2}[/itex] . no mass. why

i think its something to do with the question asking to be in per unit mass but i dont see why.

2. Relevant equations

3. The attempt at a solution

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# Total mechanical energy

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