an object with initial velocity v0, as shown above, slides up and then down a long, frictionless, inclined plane. which of the following is true of the object as it moves? (a) it has a constant acceleration while moving up the plane and a greater acceleration when moving down the plane. (b) it has a constant acceleration while moving up the plane and a smaller acceleration when moving down the plane. (c) it moves with a constant velocity both up and down the plane. (d) it has the same acceleration as it moves up and down the plane. (e) it has a continually varying acceleration as it moves up and down the plane.