March 30, 2017

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Deceleration uniformly, a car traveling 25 m/s takes 10 seconds to come to a complete stop. What is the magnitude and direction of the car's acceleration as it slows down?
North at 2.5 m/s (2)
South at 2.5 m/s (2)
North at 9.8 m/s (2)
South at 25 m/s

  • Missing initial direction - ,

    You do not say if it was moving north or south when you hit the brakes.
    Assuming it was going north and north is positive:
    v = Vi + a t
    0 = 25 + a t
    a = -25/10 = -2.5
    or 2.5 m/s^2 south

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