I can't decide between A and B, but B seems more likely to me. Even though the molecules don't look like they're moving, the area of contact is slightly more compressed.
The potential energy of a body is the maximum at the highest position of that body. So for example, if the maximum position of the ball is at 3 m, there will be the maximum potential energy.
To get the half of the maximum potential energy, the ball should be at the half of the maximum position, which is 1.5 m.
Answer:
When the acceleration of the elevator is going upward, the rider experiences a sensation of being heavier than his normal weight due to the upward normal force being more than the rider's weight.
Tidal power is the only form of energy which derives directly from the relative motions of the Earth–Moon system, and to a lesser extent from the Earth–Sun system
