A child on a wheeled cart throws a sandbag forward. As a result of this:

 Newton's third rule states that force is a push pull that operates on an item, resulting in contact with another object, and that two forces are known as action and reaction forces.

Newton's third rule of motion states that every action has an equal and opposite response. As a result, if the child throws the bag forward with power, the bag will likewise apply force to the child in the opposite direction, causing the child to go backward. As a result, 2  is the right response.