Thinking about Newton’s First Law. Why does a water powered rocket come back down? a
The rocket would like to keep on going, but gravity is an unbalanced force that pulls it down.
b
Things are lazy, and the rocket does not want to go anywhere.
c
The parachute that is on the rocket has a large enough area to make it stay in the air
d
There is not enough fuel in the rocket. Despite balanced forces, it has to come down.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.