Solving Physics Homework: Stopping Force & Momentum

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To solve the physics homework problem, the stopping force required to halt Sara's 1290 kg car in 2.32 seconds after colliding with a snowbank needs to be calculated using impulse and momentum principles. The force exerted by the engine is 4880 N, which contributes to the car's acceleration before the collision. Additionally, the momentum of the car must be determined 1.19 seconds post-collision, requiring the application of relevant physics equations. The discussion emphasizes the importance of identifying applicable equations to solve for both the stopping force and the momentum. Understanding these concepts is crucial for accurately addressing the homework questions.
silviamar21
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Homework Statement



The engine of Sara's 1290 kg car exerts a force of 4880 N at the wheels. She accelerates for 8.73 seconds and then unfortunately, she collides with a snowbank. A) find the force that would stop her car in 2.32 seconds from the impulse of the collision. B) Calculate her momentum 1.19 seconds after her collision.

Homework Equations





The Attempt at a Solution

 
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Welcome to PF, silviamar21! :smile:

Do you have a couple of equations that might be applicable to this problem?
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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