A) When the angle between the direction of force and the direction of displacement is \[0{}^\circ \]
B) When the angle between the direction of force and the direction of displacement is \[30{}^\circ \]
C) When the angle between the direction of force and the direction of displacement is \[90{}^\circ \]
D) When the angle between the direction of force and the direction of displacement is \[180{}^\circ \]
E) None of these
Correct Answer: D
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