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19 January, 14:19

2. A car traveling at 32m/s

slams on the brakes after noticing

an obstacle ahead. The car slows

down at a constant rate before

coming to a stop 4.2 seconds

later. How far did the car travel in

the 4.2 seconds it took to stop?

a. 7.6 m

b. 67.2 m

C. 86.4 m

d. 134.4 m

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Answers (1)
  1. 19 January, 17:16
    0
    b. 67.2 m

    Explanation:

    Given:

    v₀ = 32 m/s

    v = 0 m/s

    t = 4.2 s

    Find: Δx

    Δx = ½ (v + v₀) t

    Δx = ½ (0 m/s + 32 m/s) (4.2 s)

    Δx = 67.2 m
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