Identify which of the listed motions below is described by Newton's first law. Justify the answer.
Brock meandering evenly along the snowy slope.
Raindrops falling from the sky at a speed of 8 m/s.
Children on the carousel rotating at a constant speed.
A passenger plane flying on a straight track and at a constant speed over the Atlantic.
A stone falling to the ground from a height of 10 m.