You’re driving along at 25 m/s with your aunt’s valuable antiques in the back of your pickup truck when suddenly you see a giant hole in the

Question

You’re driving along at 25 m/s with your aunt’s valuable antiques in the back of your pickup truck when suddenly you see a giant hole in the road 55 m ahead of you. Fortunately, your foot is right beside the brake and your reaction time is zero! Can you stop without the antiques sliding and being damaged? Their coefficients of friction are μs=0.6 and μk=0.3. Hint: You’re not trying to stop in the shortest possible distance. What’s your best strategy for avoiding damage to the antiques?

in progress 0
Cherry 4 years 2021-08-11T06:16:46+00:00 1 Answers 278 views 0

Answers ( )

  1. thnahdat
    0
    2021-08-11T06:18:32+00:00
    Reply

    Answer:

    Explanation:

    initial velocity, u = 25 m/s

    distance, s = 55 m

    coefficient of static friction = 0.6

    coefficient of kinetic friction = 0.3

    Let the acceleration is a.

    Use third equation of motion

    v² = u² + 2as

    0 = 25 x 25 – 2 x a x 55

    a = 5.68

    a = μg

    μ = 5.68 / 9.8 = 0.58

    so, the coefficient of friction is less then the coefficient of static friction so the antiques are safe.

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )