A10-kg cart moving at 5 m/s collides with a 5-kg cart at rest and causes it to move 10 m/s. which principle explains the result?
a) law of differential mass
b) law of conservation of momentum
c) law of unequal forces
d) law of accelerated collision

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.