A small object is dropped from the top of a building and falls to the ground. As it falls, accel...

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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 window. It has speed \( v_{1} \) at the top of the window and speed \( v_{2} \) at the bottom of the window, at what point does it have a speed \( \frac{v_{1}+v_{2}}{2} \) ? Neglect the 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
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