Question

Chapter 2+ 1078498828 offsetonext Copy of 1501 Fall 2018 Clymer Chapter 2 Problem 2.28 Part A In coming to a slop, a car leaves skid marks 71 m long on the highway Assuming a doceleration of 4.10m/mate the speed of the car just before braking Express your answer using two significant figures Provide Foedback O Type here to search 6 7 8 9

Answer 1

Distance covered in braking =71m

deceleration = 4.1m/s²

final velocity is zero

Find initial velocity

Use Formula $v^{2}-u^{2}=2as$

$(0m/s)^{2}-u^{2}=-2*4.1m/s^{2}*71m$

$0^{2}-u^{2}=-2*4.1*71$

$u=\sqrt{2*4.1*71}$

ANSWER: ${\color{Red} u=24.13m/s}$

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