A velocity vs. time graph is shown. What is the acceleration of the object?

It maybe because uranus is made of gas but uranus has a solid core in the middle

Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion

Density always stays the same no matter how much of the substance is present. density also expresses the proportional relationship between mass and volume of the substance.