In which of the following cases is the work done by a force positive?

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A force acting at an angle of 45 degrees to the direction of displacement

A force acting opposite to the direction of displacement

A force acting in the same direction as the displacement

A force acting perpendicular to the direction of displacement

Answer: A force acting in the same direction as the displacement

Explanation:

When a force acts in the same direction as the displacement, the work done is positive.