Problems Part II. Show all work to be eligible for full credit 1. (10 pts) Suppo

Question

Problems Part II. Show all work to be eligible for full credit 1. (10 pts) Suppose you are driving at speed 20 m/s when you see a sudden obstacle in the road 30 m away which forces you to make a quick stop . Your reaction time before stepping on the brakes is 0.60 s, d the deceleration a of your car is constant. What is the value of the acceleration? Follow the re outlined on the first page. In your diagram, include the axis the initial ad final positions your origin, the positive direction, and all the variables. Include a detailed diagram.

Explanation / Answer

during reaction time,

d1 = (20)(0.6) = 12 m

distance remaining d = 30 - d1 = 18 m

vf = 0

Applyig vf^2 -vi^2 = 2 a d

0^2 - (20^2) = 2(a)(18)

a = - 11.11 m/s^2 .......Ans

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