Question

an object of the same mass has three different weights at different times. which statement is possible? the object gains matter and then loses it. the object started on earth, was transported to space, and was deposited on the moon. the object started at the bottom of a hill, then moved to the top of the hill, and then moved back down to the bottom of the hill. the object changes shape, which changes its weight.

Explanation:

Weight is the force exerted on an object due to gravity. Mass is the amount of matter in an object and is constant. Gravity varies in different locations (e.g., Earth, moon, different altitudes on Earth). When an object's location changes (from Earth to moon or from bottom - to - top of a hill on Earth), the gravitational force acting on it changes, thus changing its weight. Changing shape doesn't directly change weight. Losing matter changes mass and thus can change weight, but the key here is the impact of location on gravitational force.

Answer:

The object started at the bottom of a hill, then moved to the top of the hill, and then moved back down to the bottom of the hill. (This option implies a change in gravitational potential energy and thus a change in weight due to the change in height in Earth's gravitational field.)