Q.) The escape speed from the surface of Planet Zoroaster is 15.0 km/s. The planet has no atmosphere. A meteor far away from the planet moves at speed 5.0 km/s on a collision course with Zoroaster. How fast is the meteor going when it hits the surface of the planet? My answer: 15+5=20km/s since they both are going towards each other. But keep getting this answer wrong....i've tried 15km/s as well which is also wrong What am i doing wrong here?