Which of the planets do not have moons?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

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.

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car