Recall and use the equation for the change in gravitational potential energy ΔE_p = mgΔh

Define gravitational field strength as force per unit mass; recall and use the equation gravitational field strength = weight / mass, g = W/m and know that this is equivalent to the acceleration of free fall

State that the acceleration of free fall g for an object near to the surface of the Earth is approximately constant and is approximately 9.8 m/s²