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So here in this case gravity is doing negative work when you throw the
ball upwards. Hence the work done by gravitational force is negative.
Mathematically when displacement is opposite to the force work done
is given by
o Negative work just means that the force and the displacement act in
opposite directions.

Case of zero work done

o If the directions of force and the displacement are perpendicular to
each other, the work done by the force on the object is zero.