13.

[-/2.35 Points]DETAILSOSCOLPHYS2016 4.3.P.009.

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PRACTICE ANOTHER

Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts a force of74.0N,the second a force of95.0N,friction is15.0N,and the mass of the third child plus wagon is23.0 kg.

(a)

What is the system of interest if the acceleration of the child in the wagon is to be calculated? (Select all that apply.)

the child in the wagonthe wagonthe children outside the wagon

(b)

Draw a free-body diagram, including all forces acting on the system.

(c)

Calculate the acceleration in m/s². (Enter the magnitude.)

m/s²

(d)

What would the acceleration be (in m/s²) if friction were21.0N? (Enter the magnitude.)

m/s²