Earth travels about 30 km/s relative to the Sun. When you leap upward in front of a wall, the wall doesn't slam into you at 30 km/s because the wall
A. has negligible inertia compared with the Sun.
B. has too little gravity to influence you.
C. moves in the opposite direction to you.
D. and you move at the same horizontal speed, before, during, and after your jump.
Answer: D
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