What is the minimum speed required to leave the planet Earth (escape velocity)?

(A) 20,000 km/h
(B) 30,000 km/h
(C) 40,000 km/h
(D) 50,000 km/h

The answer is: (C) 40,000 km/h
A minimum speed of 40,000 km/h is required to leave the planet Earth and enter space.