Mechanics 1 - Newtons laws of motion homework HELP

there's 2 questions I'm stuck on. first one is:

4) a car of mass 900kg tows a caravan of mass 500kg against resistances totaling 700N. the resistances on the car and caravan are proportional to their masses (k x mass, k is a constant). the car is accelerating at 0.8ms-2 along a horizontal road. by modeling the car and caravan as a pair of connected particles, find the driving force exerted by the engine and the tension in the tow-bar.

there's 2 questions I'm stuck on. first one is:

4) a car of mass 900kg tows a caravan of mass 500kg against resistances totaling 700N. the resistances on the car and caravan are proportional to their masses (k x mass, k is a constant). the car is accelerating at 0.8ms-2 along a horizontal road. by modeling the car and caravan as a pair of connected particles, find the driving force exerted by the engine and the tension in the tow-bar.

6) a block A of mass 100kg suspended by a vertical cable. a block B of mass 150kg is suspended from A by means of a second vertical cable. the blocks are raised 10m in 10 seconds, starting from rest. find the tension in each cable.

any help is appreciated!! thank you


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