Question

17) A Super Dogl flies by and has 1,780 Joules of Potential Energy. IfSuper Dog! is flying at an altitude of 15 meters, what is its mass?PS Must say Super Dog! in a superman voice. He is thegoodest of all the good dogs after all.

Answer 1

In this case, we have to use the potential energy definition

$U=m\cdot g\cdot h$

Where U = 1,780 Joules, h = 15 meters, g = 10 m/s2. Let's replace these values and solve for m

$\begin{gathered} 1,780J=m\cdot10m/s^2\cdot15m \\ 1,780J=m\cdot150m^2/s^2 \\ m=\frac{1,780J}{150m^2/s^2} \\ m\approx11.87\operatorname{kg} \end{gathered}$

Hence, its mass is around 11.87 kilograms.