Interactive LearningWare 4.1 reviews the approach taken in problems such as this

Question

Interactive LearningWare 4.1 reviews the approach taken in problems such as this one. A 1580-kg car is traveling with a speed of 12.2 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 45.1 m? Interactive LearningWare 4.1 reviews the approach taken in problems such as this one. A 1580-kg car is traveling with a speed of 12.2 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 45.1 m? Interactive LearningWare 4.1 reviews the approach taken in problems such as this one. A 1580-kg car is traveling with a speed of 12.2 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 45.1 m?

Explanation / Answer

The acceleration required is

a = v^2 - v0^2 / 2x

= - (12.2m/s)^2 / (2(45.1))

= -1.65 m/s^2

Newton's second law then gives the magnitude of the net force as

F = ma

= 1580 * 1.65

= 2607 N

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