Will Karan stop in time before hitting the skunk? Physics chase problem help!

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In summary, Karan stops in time before she hits the skunk and the skunk crosses the road before Karan get there.
  • #1
7282
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Physics chase problem help!

Hi, I'm having a lot of difficulty with my physics homework. I'd really appreciate it if someone would help me out here :D

Homework Statement


Karan is driving at 90 km/h on a straight road at night, when she sees a skunk cross the road 60.0m ahead of this car. It takes him 0.25s to react before he puts on the brakes and decelerates at -5.00m/s2. Meanwhile, the skunk obliviously walks across the 5.00m wide road at 0.70 m/s. Calculate whether
a) Karan stops in time before she hits the skunk
b) the skunk crosses the road before Karan get there; or
c) Karan squishes the skunk

Homework Equations


I've just been given basic kinematics equations.
With variables v, d, t, a

The Attempt at a Solution


I'm not sure how to start answering this question.
 
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  • #2


The obvious first step is to convert all into SI system i.e km/hr to m/s..etc

from here there is a 2 way approach..

go with karan or skunk

for karan...

find time taken to reach at 60meter from origin
then use time to find whether the skunk manages to crosses
if skunk just reaches then it is crushed
if skunk dosent reach then karan is faster
if skunk reaches and travels more then it reaches faster

for skunk...

find time taken to cross the road
then compute whether karan travels less than 60 m or more in given time

if more then karan crosses first
if less then skunk passes first
if equal then god save the skunk

here it is assumed that karan travels along opp edge of 5.00 m wide road from where skunk starts walking

hope it helps
 
  • #3


Draco27 said:
The obvious first step is to convert all into SI system i.e km/hr to m/s..etc

from here there is a 2 way approach..

go with karan or skunk

for karan...

find time taken to reach at 60meter from origin
then use time to find whether the skunk manages to crosses
if skunk just reaches then it is crushed
if skunk dosent reach then karan is faster
if skunk reaches and travels more then it reaches faster

for skunk...

find time taken to cross the road
then compute whether karan travels less than 60 m or more in given time

if more then karan crosses first
if less then skunk passes first
if equal then god save the skunk

here it is assumed that karan travels along opp edge of 5.00 m wide road from where skunk starts walking

hope it helps

Thanks a lot it did help managed to solve the question :D I'm not sure if its right but yea!
 

Related to Will Karan stop in time before hitting the skunk? Physics chase problem help!

What is a "physics chase problem"?

A physics chase problem is a type of problem that involves analyzing the motion of two or more objects in pursuit of each other. This can include situations such as a car chasing another car, a predator chasing its prey, or a person running to catch a train.

What are the key concepts involved in solving a physics chase problem?

The key concepts involved in solving a physics chase problem include velocity, acceleration, displacement, and time. These concepts are used to calculate the motion of each object and determine when and where they will intersect or collide.

What are the steps to solving a physics chase problem?

The steps to solving a physics chase problem are: 1) Identify the objects involved and their initial positions and velocities, 2) Determine the equations that describe the motion of each object, 3) Set up the equations in terms of the same variable (usually time), 4) Solve the system of equations to find the time and location of the intersection or collision, and 5) Check the solution for reasonableness and accuracy.

What are some common mistakes when solving a physics chase problem?

Some common mistakes when solving a physics chase problem include: 1) Using the wrong equations or not setting them up correctly, 2) Not considering the direction of motion and using negative signs appropriately, 3) Forgetting to convert units, and 4) Failing to check the solution for reasonableness.

How can understanding physics chase problems be useful in real life?

Understanding physics chase problems can be useful in real life situations such as sports, traffic accidents, and emergency response. It can also help improve problem-solving skills and critical thinking abilities, which are valuable in many fields and careers.

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