A fly undergoes a displacement of -5.80 m while accelerating at -1.33 m/s^2 for 4.22 s what was the initial velocity of the fly in m/s

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?

2) why do satelites not fall while revolving around the earth?

Elements that have one valence electron and are very reactive are called