Answer:
E) The object achieves its maximum speed at approximately x=3m.
Explanation:
Since the object is moving in gravitational field
potential energy + kinetic energy = constant = 14 J
At x = 3 m , potential energy is minimum that is zero
kinetic energy will be maximum .
Kinetic energy = 14 - 0 = 14 J
Hence option ( E ) is the answer.
More force is needed for more mass. Therefore, if the mass is greater and the force is not enough then the object will less likely accelerate