A 15-kg grocery cart is travelling at 4 m/s across a level parking lot. A child runs up to the cart and starts pushing it with a force of 12-N in the direction of the cart's motion. The child keeps pushing the cart with the same force for three meters and then he lets it go. The work done by the child on the cart is: Group of answer choices a. 36 J b. 120 J c. 18 J d. 4 J

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