1. A car of mass M pulls a trailer of mass m along a straight level road at constant speed. The car experiences a resistance to motion of 5000 N and the trailer feels a resistance to motion of 1000 N. (i) Draw diagrams showing all of the forces acting on the car and on the trailer.
(ii) By considering the forces on the whole system of car and trailer, find the
driving force in the engine.
(iii) By considering the forces on the trailer only, find the tension in the towbar.

linear pair postulates

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc