Numerical - Average resistance to stop a truck for given speed

Q.  What is the average resistance required to stop a truck of mass 600 kg in a distance of 30 m, if initial speed is 30 m/sec?
- Published on 21 Sep 15

a. 8000 N
b. 9 kN
c. 9.5 kN
d. 9 N

ANSWER: 9 kN

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    Discussion

  • Sravanthi   -Posted on 15 Dec 15
    Given: Mass of truck = 600 kg, initial speed = 30 m/sec

    Formula: Using kinematic equations, v2 = u2 + 2as

    Solution:

    To find average resistance, calculate acceleration using the formula v2 = u2 + 2as

    0 = (30)2 + ( 2 x a x 30)

    a = - 15 m/s2

    Average resistance = (- F) = ma

    - F = 600 x (-15)

    Average resistance = 9000 N = 9 kN

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