Momentum Changes for Each of These Scenarios Except for

Multiple Choice

Momentum changes for each of these scenarios except for

A) a falling rock from an instant after initial drop from a high tower until an instant before impact.
B) a movie stunt performer flying on a parabolic path before the performer stops on the ground.
C) a rocket sled on a horizontal track from an instant after the drag parachute opens until an instant before the sled comes to rest.
D) a block sliding at constant speed (with friction) down an inclined plane.
E) a neutron in a nuclear reactor that changes the direction but not the magnitude of its velocity when it scatters off another neutron.