A car of mass 1500kg is pulling a trailer of mass 750 kg up a straight hill of length 800 m inclined at an angle of arcsin(0.08) to the horizontal. The resistances to the motion of the car and trailer ure 400 N and 200 N respectively. The car and trailer are connected by a light rigid tow-bar. The car and trailer have speed 30m * s ^ - 1 at the bottom of the hill and 20m * s ^ - 1 at the top of the hill, After reaching the top of the hill the system consisting of the car and trailer travels along a straight level road. The driving force of the car's engine is 2400 N Find the acceleration of the system and the tension in 8. and the resistances to motion are unchanged. the tow-bar.

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.