Consider a distant planet having a radius of 3,000 kilometres and unknown mass. If an object is dropped from a height of 1,500 kilometres, what will be its velocity just before it hits the ground? (Assume the acceleration due to gravity on planet’s surface is 3 m/s².)

(A) 3,000 m/s
(B) 1,000 m/s
(C) 2,000 m/s
(D) Mass of the planet is required