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**1. Homework Statement**

A child pulls a trolley by the handle along a ﬂat sidewalk. She exerts a force of 80.0 N at an angle of 30.0° above the horizontal while she moves the wagon 12 m forward. The force of friction on the trolley is 34 N.

**2. Homework Equations**

(a) Calculate the mechanical work done by the child on the trolley.

(b) Calculate the total work done on the trolley

**3. The Attempt at a Solution**

W=F(cos)

80 cos(30)

W=F(cos)

80 cos(30)

W=Fcosdeltad

W=80 N(cos30)(12)

=148J

b)Idk how to do it.