Ask Question
22 September, 13:13

Compared to 15 mph on a dry road, about how much longer will it take for

you to stop at 30 mph on a snow-covered road?

2 to 3 times

4 to 6 times

8 to 10 times

+5
Answers (2)
  1. 22 September, 13:31
    0
    8 to 10 times

    Explanation:

    For dry road

    u = 15 mph (1 mph = 0.44 m/s)

    u = 6.7 m/s

    Let take coefficient of friction (μ) of dry road is 0.7

    So the de acceleration a = μ g

    a = 0.7 x 10 m/s ² (g=10 m/s ²)

    a = 7 m/s ²

    We know that

    v = u - a t

    Final speed, v=0

    0 = 6.7 - 7 x t

    t = 0.95 s

    For snow road

    μ = 0.4

    de acceleration a = μ g

    a = 0.4 x 10 = 4 m/s ²

    u = 30 mph = 13.41 m/s

    v = u - a t

    Final speed, v=0

    0 = 30 - 4 x t'

    t'=7.5 s

    t'=7.8 t

    We can say that it will take 8 to 10 times more time as compare to dry road for stopping the vehicle.

    8 to 10 times
  2. 22 September, 13:37
    0
    I would say 2-3 times but I'm not quite sure
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “Compared to 15 mph on a dry road, about how much longer will it take for you to stop at 30 mph on a snow-covered road? 2 to 3 times 4 to 6 ...” in 📗 Engineering if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers