How long it takes for a car to catch a truck

  • Thread starter Pioneer98
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  • #1
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Homework Statement


A car traveling 91 km/h is 200m behind a truck traveling 81 km/h . How long will it take the car to reach the truck?

Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
SammyS
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Homework Statement


A car traveling 91 km/h is 200m behind a truck traveling 81 km/h . How long will it take the car to reach the truck?

Homework Equations



The Attempt at a Solution

Hello Pioneer98. Welcome to PF !

What have you tried?

Where are you stuck?
 
  • #3
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I'm actually not even sure where to start. My professor gave us four kinematic equations to memorize and use. I know how to use those, but the things he went over in class are totally different from the online homework.
 
  • #4
HallsofIvy
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Motion is always relative. The car is traveling at 10 km/hr faster than the truck. How long will it take to cover 200 m?
 
  • #5
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20 seconds?
 
  • #6
SammyS
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20 seconds?
That would be true if car were traveling 10 m/s faster than the truck. Units matter !

Convert 10 km/hr to m/s .
 
  • #7
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10,000 m/hr, 2 7/9 m/s, so it takes 72 seconds for the car to reach the truck. Thanks for the help guys!!
 

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