physics

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A car enters the freeway with a speed of 6.9
m/s and accelerates uniformly for 3.3 km in
2.8 min.
How fast is the car moving after this time?
Answer in units of m/s

  • physics -

    t = 2.8min * 60s/min = 168 s.

    d = Vo*t + 0.5a*t^2 = 3300 m.,
    6.9*168 + 0.5a*(168)^2 = 3300
    1159 + 14112a = 3300
    14112a = 3300-1159 = 2141
    a = 0.152 m/s^2.

    V = Vo + at = 6.9 + 0.152*168=25.5 m/s.

  • physics -

    oops! It is Henry Not anonymous.

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