A runner makes one rap round 200m track in a time 25s, what is the average speed and velocity

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? 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 marias voyage take according to samir?

Does anyone have the answers to online physics course plato course physics, semester a v3.0

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply