Question: Force 1 acts on a particle and does work W1. Force 2 acts simultaneously on the particle and does work W2. The speed of the

Force 1 acts on a particle and does work W1. Force 2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true?
(a) W1 is zero and W2 is positive
(b) W1 = -W2
(c) W1 is positive and W2 is zero
(d) W1 is positive and W2 is positive

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