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Hold your open hand at shoulder-height, and have your associate carefully place a bowling ball in your hand. Now allow the hand and bowling ball to descend slowly to the floor. Your hand has done 'negative work', equal to the (weight of the ball) times (distance it descended).
Negative * positive = negative Positive * positive = positive Negative * negative = positive
No, a negative plus a negative is a negative
A negative plus a negative equals a negative.
A negative plus a negative still gives a negative answer.