This is a "trick" question.
If the elevator is traveling at constant speed, it means it is at rest. This means anything inside the elevator traveling at constant speed, weights the same as in an elevator not moving -also at rest-.
So the 100N weight's weight doesn't change in an elevator traveling at constant speed.
"Wheel & Axle" <span>can be described as a shaft that is attached to the center of a wheel
Hope this helps!</span>
Answer:
rubbing your socks on carpet
rubbing your hair with glove