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Question
A 1100-kg car pulls a boat on a trailer. (a) What total force resists the motion of the car, boat, and trailer, if the car exerts a 1900-N force on the road and produces an acceleration of $1.20 \textrm{ m/s}^2$? The mass of the boat plus trailer is 700 kg. (b) What is unreasonable about the result? (c) Which premise is unreasonable, and why is it unreasonable?
Question by OpenStax is licensed under CC BY 4.0.
Final Answer
  1. $-260 \textrm{ N}$
  2. The friction force is in the direction of motion. This is not possible.
  3. The acceleration can not be this large with only a 1900 N force from the car.
Solution Video

OpenStax College Physics Solution, Chapter 4, Problem 38 (Problems & Exercises) (2:22)

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