A body weighing 300g is at a certain height and has an energy of 45J. How high is it?

Formula: E = mgh
E – energy, J (according to conventional 45 J)
m – weight, kg (according to conventional 300g = 0.3 kg)
g – acceleration due to gravity, 9.8 m / s ^ 2 (constant)
h – height, m
Let us derive the desired height from this formula by dividing each part (to the left and right of the equal sign) by mg:
h = E / mg
Substitute the known values:
h = 45J / 0.3kg * 9.8m / s ^ 2 = 15.3m
Answer: 15.3 m