The cart A experienced the greatest impulse.
The given parameters;
Impulse is defined as the product of the applied force and time of action of the applied force.
J = Ft
where;
J is the impulse
F is the applied force
t is the time of action
The impulse experienced by cart A;
J = 2 x 2 = 4 Ns
The impulse experienced by cart B;
J = 1 x 3 = 3 Ns
Thus, the cart A experienced the greatest impulse.
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