As the wagon is been pulled forward with a constant force, the impulse Impulse imparted to the  wagon and the little girl is 60.3kg.m/s
Given the data in the question;
- Mass of little sister; [tex]m_s =25kg[/tex]
- Mass of wagon; [tex]m_w = 8.5kg[/tex]
- time; [tex]t = 2.35s[/tex]
- Since the wagon was originally at rest, Initial velocity; [tex]u = 0m/s[/tex]
- Final velocity; [tex]v = 1.8m/s[/tex]
Impulse is the force applied for certain amount of time which results in change in momentum.
[tex]I = M( v-u )[/tex]
To determine the impulse you imparted to the  wagon and its passenger.
Total mass[tex]M = ( m_s + m_w) = ( 25kg + 8.5kg ) = 33.5kg[/tex]
So, we substitute our given values into the equation
[tex]I = 33.5kg(\ 1.8m/s\ -\ 0m/s\ )\\\\I = 33.5kg \ *\ 1.8m/s \\\\I = 60.3kg.m/s[/tex]
Therefore, as the wagon is been pulled forward with a constant force, the impulse Impulse imparted to the  wagon and the little girl is 60.3kg.m/s
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