Escape Velocity Calculator Knowledge Check

A research probe needs to escape a dwarf planet with a radius of 250 km. If the required escape velocity is 150 m/s, what is the mass of the dwarf planet in kg? (Use $G = 6.67 \times 10^{-11} \text{ m}^3\text{kg}^{-1}\text{s}^{-2}$)