. If the Earth was the size of a basketball, about 24 centimeters in diameter, about how thick is the Earth’s crust?

the entire thickness of the ball’s diameter

the thickness of the leather covering and another inch (or 2.5 centimeters) below that

the thickness of the leather covering

6 centimeters thick, or half the radius

Which statement is true? a) the work done to lift an object 6 meters is greater than the gravitational potential energy it gains. b) the work required to push an object is less than the work required to pull an object the same distance. c) the work required to raise an object to a height is equal to the gravitational potential energy the object gains. d) the work done against gravity to lift an object straight up is greater than the work required to roll it up a ramp.