Question

I raise a hammer that has a weight of 500g to a height of 0.3meters, then release, what's the speed when it will touch the ground, if energy lost is neglected?

Answer 1

I found the potential energy when it was at 0.3m, which is 0.15J, then I don't know what to do.

Answer 2

Although I tried this out:
Since
Then
\(\large \begin {align} E_k &= \frac{1}{2}mv^2 \\
0.15J&=\frac{1}{2}(0.5)v^2\\
v&\approx 0.77459m/s \\
\end{align}\)