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23 February, 18:10

A roach moves down the hall at 1.2 m/s. When he sees the janitor coming down the hall, he begins to run. After 3.2 s, he is moving at 3.6 m/s. What is his acceleration

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  1. 23 February, 18:22
    0
    0.75 m/s^2.

    Explanation:

    Given:

    vi = 1.2 m/s

    vf = 3.6 m/s

    t = 3.2 s

    Using the equation of motion:

    vf = vi + at

    3.6 - 1.2 = 3.2a

    a = 2.4/3.2

    = 0.75 m/s^2.
  2. 23 February, 19:45
    0
    The acceleration is

    Explanation:

    Vo=Initial velocity

    V = Final velocity

    a = acceleration

    t = time

    V = Vo + a*t.

    Vo = 1.2 m/s, V = 3.6 m/s, t = 3.2 s, a = ?.

    3.6=1.2 + a x 3.2, so

    3.6-1.2=3.2a

    2.4=3.2a

    a = 2.4/3.2

    =0.75 m/s2
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