Mechanics: Collision, friction, work, energy,

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  = 21952 x 8 = 175616 J Whole of the kinetic energy possessed by the two cars immediately after collision is utilised in doing work against friction between the cas's tyres and the ground during skidding.

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  Hence according to work energy rule we can write Work done against friction = loss in elastic potential energy - Gain in gravitational potential energy As the magnitude of normal force N is equal to the component of weight Mg normal to the

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  By momentum law, m1*u1 + m2*u2 = m*v => 70*7.1 - 130*5.1 = 200*v => v = -0.83 m/s Now two guys will slide with the common velocity (= 0.83 m/s) and their kinetic energy will be lost in work done against friction force.

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  This will be equal to the work done by the friction before stopping. So Now . Using this we can calculate the co-effiecient of friction.