Natalia lifts a bag of groceries 0.50 m by exerting a force of 36 N. How much work did she do on the bag?

Work is force multiplied by displacement in the direction of the force: W = Fd. Using 36 N and 0.50 m gives W = 36 × 0.50 = 18 J, so the correct choice is 18 J.

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