Can work be negative?

Hello, i am doing an assignment and there is a research question that i need to answer.
The question is: Can work be negative?

From what i search on the internet these are my thoughts:
Work is defined by W=F.D
But work is not a vector, because it has units of energy and energy isnt vector and also it has no direction. So work can be negative in an exercise until the exercise is solved. Work is positive.

Is that right? And if not can you help me please? Thank you.

http://ift.tt/Ozd9io

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