A Meteoroid,heading Straight for Earth,has a Speed of 14

Multiple Choice

A meteoroid,heading straight for Earth,has a speed of 14.8 km/s relative to the center of Earth as it crosses our moon's orbit,a distance of 3.84 × 10⁸ m from the earth's center.What is the meteroid's speed as it hits the earth? You can neglect the effects of the moon,Earth's atmosphere,and any motion of the earth.(G = 6.67 × 10^-11 N • m²/kg²,

A) 18.5 km/s
B) 21.5 km/s
C) 32.4 km/s
D) 87.3 km/s