Solving for time in a frustrating dynamics question

In summary, the question asks for the reaction time of a driver to stop a car before entering an intersection, given that the emergency breaking system decelerates the car at a rate of -4.0m/s^2. The suggested approach is to use a graphical method or the SUVAT equations to solve the problem.
  • #1
Meeeessttteeehh
19
4

Homework Statement


If a car has an emergency breaking system that can be pulled by the driver, which will decelerate the car at a rate of -4.0m/s^2, how long does the driver have to react before it is too late. (If she enters the intersection at all is it too late?)

Homework Equations


No idea, but lots of information already solved in previous questions... picture below.

The Attempt at a Solution


I have literally no idea. Any help is greatly appreciated!
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  • #2
Sorry, the information you have provided is unreadable.
 
  • #3
These sorts of problem are often more easily "grocked" using a graphical approach.

Hint: The area under a velocity versus time curve is the distance traveled.
 
  • #4
Perhaps start by assuming the car stops just before entering the interaction and work back from there.
 
  • #5
Have you ever hear of the SUVAT equations? One of these equations will allow you to solve this problem. Can you guess which one to use?
 

FAQ: Solving for time in a frustrating dynamics question

How do I solve for time in a frustrating dynamics question?

Solving for time in a frustrating dynamics question can be tricky, but the key is to carefully analyze the given information and use the appropriate equations to find the unknown time variable.

What are the common mistakes people make when trying to solve for time in a dynamics question?

One common mistake is using the wrong equation or incorrectly setting up the problem. It's important to carefully read the question and identify what information is given and what is being asked for.

Are there any tips or tricks for solving dynamics questions involving time?

One helpful tip is to draw a diagram or visualize the problem to better understand the situation and what variables are involved. It's also important to show all your work and clearly label your equations and variables.

How can I check if my answer for the time variable is correct?

You can check your answer by plugging it back into the original equation and seeing if it satisfies all the given information. You can also use common sense and consider if your answer makes sense in the context of the problem.

Can I use the same method to solve for time in all dynamics questions?

No, different dynamics questions may require different approaches and equations to solve for time. It's important to carefully read and understand each question before attempting to solve it.

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