Answer :
The work done in the particle is negative when the direction of force and displacement are same.
What is displacement ?
displacement is defined as the change in position of an object. It is a vector of quantity and has a direction and the magnitude. It is the represented as an arrow that of points from to the starting position to the final position. For example- If an object moves from Column A position to column B, then the object's position changes.
displacement it is (symbolise as d or s ) also called length or distance ,is a one dimensional quantity representing the separation between two defined points.
Sol-In this case the force is acting to right and the it's movement of the particle is to the the left. Which is in opposite direction to the each other so the work done by the force on the particle is negative.
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