Objects that fall near Earth’s surface are rarely in free fall.
"Free fall" is the situation where the ONLY force on an object is
the force of gravity, and nothing else.
Objects near Earth's surface are almost always surrounded by air.
If they are falling, then the air is exerting forces on them, and they
are not in "free fall".
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photocells convert light energy to electricity
if the person is shown to have +90n, then ans is -10n.
if the person is shown to have -90n, then ans is +10n.