Alex is standing still and throws a football with a speed of 10 m/s to his friend, who is also standing still. The two friends are standing 5 meters apart.
Answer
A
Alex observes it as 10 m/s, and his friend observes it as less than 10 m/s.
B
Alex observes it as less than 10 m/s, and his friend observes it as 10 m/s.
C
Both Alex and his friend observe it as 10 m/s.
D
Both Alex and his friend observe it as less than 10 m/s.