Answer :

Final answer:

To find the reaction force at the rear axle of the trailer, we need to consider the forces acting on the trailer. First, calculate the total resisting force experienced by the boat and trailer. Then, calculate the tension force in the hitch using the fact that 80% of the resisting forces are experienced by the boat and trailer. This tension force is the reaction force at the rear axle of the trailer.

Explanation:

To find the reaction force at the rear axle of the trailer, we need to consider the forces acting on the trailer. Since the trailer is attached to the cab, there is a tension force in the hitch between them. This tension force can be calculated using Newton's second law. In this case, we can assume that 80% of the resisting forces are experienced by the boat and trailer, and the remaining 20% is experienced by the rear axle of the trailer.

First, let's calculate the total resisting force experienced by the boat and trailer:

Resisting Force = mass of the boat plus trailer × acceleration

Next, we can calculate the tension force in the hitch using the fact that 80% of the resisting forces are experienced by the boat and trailer:

Tension Force = 80% × Resisting Force

This tension force is the reaction force at the rear axle of the trailer.

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Rewritten by : Barada