Two adults and a child want to push a wheeled cart in the direction marked x.

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Two adults and a child want to push a wheeled cart in the direction marked x. The two adults push with horizontal forces and as shown
in the figure. (a) Find the magnitude and direction of the smallest
force that the child should exert. You can ignore the effects of friction.
(b) If the child exerts the minimum force found in part (a), the cart accelerates at in the -direction. What is the weight of the cart?

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