Police Car Overtaking Speeder: How to Calculate the Time and Distance?

  • Thread starter Monocerotis
  • Start date
In summary, the problem involves a police car traveling at 90 km/h being passed by a speeder traveling at 130 km/h. The police car then accelerates at 2.00 m/s^2 and the question asks for the time it takes for the police car to overtake the speeder. To solve this, we can use the equations for motion with constant acceleration and constant velocity to find the positions of both vehicles at time t and determine when they are equal.
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Monocerotis
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Homework Statement



A police ar traveling a constant 90 km/h is passed by a speeder travelig 130 km/h. 1.00s after the speeder passes, the policeman steps on the accelerator. If the police car's acceleration is 2.00 m/s^2, how much time elapses after the police car is passed until it overtakes the speeder (assumed moving at a constant speed)



The Attempt at a Solution


This is my first encounter with these types of problems, at the level where I need to solve it without trial and error graphing.

Could someone provide a bit of guidance because I'm not sure how to do this problem.
 
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  • #2
What is the position of the speeder at time t.
What is the position of the policeman at time t.
for what t are they equal.

motion with constant acceleration:
[tex] x = x_0 + v_0 t + (1/2) a t^2 [/tex]

motion with constant velocity
[tex] x = x_0 + v_0 t [/tex]
 

1. What is a police pursuit?

A police pursuit, also known as a high-speed chase, is when a law enforcement officer pursues a suspect in a vehicle in an attempt to stop or apprehend them.

2. What is the purpose of a police pursuit?

The purpose of a police pursuit is to stop or apprehend a suspect who is fleeing from the scene of a crime or who poses a threat to public safety. This can also help gather evidence and bring the suspect to justice.

3. What are the risks involved in a police pursuit?

There are several risks involved in a police pursuit, including endangering the lives of the officers, the suspect, and innocent bystanders. It can also result in property damage, increased traffic violations, and legal liabilities for the law enforcement agency.

4. What are the guidelines for a police pursuit?

The guidelines for a police pursuit vary by jurisdiction, but generally, officers are required to consider factors such as the seriousness of the crime, potential danger to the public, and the likelihood of apprehending the suspect. The use of force and communication with other officers is also important.

5. Are there alternatives to a police pursuit?

Yes, there are alternative methods for apprehending a suspect, such as setting up a perimeter, using surveillance technology, or waiting for the suspect to be in a controlled environment before making an arrest. These alternatives may be safer and more effective in certain situations and can be considered by law enforcement agencies.

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