[" You drop a ball from a window located on an upper floor "],[" of a building.It strikes the ground with speed "v" .You now "],[" repeat the drop,but your friend down on the ground throws "],[" another ball upward at the same speed "v" ,releasing her ball "],[" at the same moment that you drop yours from the window."],[" (a) at the halfway point between window and ground,"],[" (b) above this point,"],[" (c) below this point "],[" (d) cannot be determined "]