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Work done is the product of force and displacement. we know that sometimes displacement can be negative. so in this case work done is negative
0 0 0
but then how can it be scalar and scalar quantity kabhi negative nahi hoti
it is a scalar quantity because it is the dot product of force and displacement
u know what is meant by dot product?
but scalar quantity can't be negative
sign convention does not indicate the direction

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If the displacement is in a direction opposite to the force,
i.e., θ = 180°, then cos 180° = -1
              W = - F * S
The work done is negative. This is usually the case when the force
opposes the motion or it tries to stop a moving body.
Example :-
When a body moves on a surface , the force of friction between the body
and the surface is in a direction opposite to the motion of the body. Therefore, 
the work done by the force of friction is negative.
1 5 1
anurag can u draw and send me the graph for freely falling body
I mean displacement time graph
free falling and disp. time graph is different and in comment how can i sent u
I have posted this que . answer there
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