Answer:
1.00 m/s^2
Explanation:
The problem can be solved by using Newton's second law:
[tex]F=ma[/tex]
where
F is the net force acting on an object
m is the mass of the object
a is its acceleration
In this problem, F=35 N (the force applied by Amber) and
[tex]m=32 kg+3 kg=35 kg[/tex]
is the mass of the wagon + the brother, so the acceleration of the wagon and the brother is
[tex]a=\frac{F}{m}=\frac{35 N}{35 kg}=1.00 m/s^2[/tex]