Hi there!
Recall the equation for gravitational potential energy:
[tex]GPE = U = mgh [/tex]
m = mass (kg)
g = acceleration due to gravity (9.8 m/s²)
h = height (m)
We are given the GPE, so we can solve for mass:
[tex]86000 = m * 2000 * 9.8[/tex]
Solve for m:
[tex]m = \frac{86000}{2000(9.8)} = \boxed{4.39 kg}[/tex]
