300
Earth moves about 30 km/s relative to the Sun. When you jump upward in front of a wall, the wall doesn’t slam into you at 30 km/s. This is because the wall
a. has too little gravity to influence you.
b. moves in an opposite direction to you.
c. and you are moving at the same horizontal speed before, during, and after your jump.
d. has negligible inertia compared with the Sun.
What is c. and you are moving at the same horizontal speed before, during, and after your jump?