During takeoff, a plane accelerates at 4 m/s and takes 40 s to reach takeoff speed. what is the velocity of the plane at takeoff?

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?