A spacecraft m is heading toward the center of the moon with a velocity of 2000 mi/hr

Question:

A spacecraft m is heading toward the center of the moon with a velocity of 2000 mi/hr at a distance from the moon’s surface equal to the radius R of the moon. Compute the impact velocity v with the surface of the moon if the spacecraft is unable to fi re its retro-rockets. Consider the moon fixed in space. The radius R of the moon is 1080 mi, and the acceleration due to gravity at its surface is 5.32 ft/sec².