A small object is dropped from the top of a building and falls to the ground. As it falls, accelerating due to gravity, it passes a window. If it has speed v1 at the top of the window, and speed v2 at the bottom of the window, at what point does it have a speed (v1+v2)/2?
Neglect the effect of air resistance.
A. It depends on the height of the window or its distance from the top of the building
B. Above the centre point of the window
C. Below the centre point of the window
D. At the centre point of the window