Need help with this: A Jaguar in an auto accident in England in 1960 left thelon

Question

Need help with this: A Jaguar in an auto accident in England in 1960 left thelongest recorded skid marks on a public road: an incredible 290-mlong. As we will see later, the friction force between the tiresand the pavement varies with speed, producing a deceleration thatincreases as the speed decreases. Assuming an average accelerationof - 4.3 m/s2 (that is, -0.44 g), calculate the Jag's speed whenthe brakes locked. A Jaguar in an auto accident in England in 1960 left thelongest recorded skid marks on a public road: an incredible 290-mlong. As we will see later, the friction force between the tiresand the pavement varies with speed, producing a deceleration thatincreases as the speed decreases. Assuming an average accelerationof - 4.3 m/s2 (that is, -0.44 g), calculate the Jag's speed whenthe brakes locked.

Explanation / Answer

vf = 0, we need to find vi, here s =290m vf2 - vi2 =2as => vi = (-2as) =(-2*(-4.3m/s2)*290m)=49.94 m/s

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