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Rail way car acceleration problem

  • Thread starter raman911
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  • #1
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The engine of a train has mass of 5*10^4kg. It can accelerate six rail way cars having a total mass of 3*10^5kg at 0.40m/s^2. What acceleration can it give four railway cars having a total mass of 2*10^5kg?
i don't know what to do?
plz help
 

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  • #2
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help plzzzzzzzzzz
 
  • #3
PhanthomJay
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The engine of a train has mass of 5*10^4kg. It can accelerate six rail way cars having a total mass of 3*10^5kg at 0.40m/s^2. What acceleration can it give four railway cars having a total mass of 2*10^5kg?
i don't know what to do?
plz help
you should start by showing us what you know about Newton's 2nd law and how you might apply it to solve this problem.
 
  • #4
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you should start by showing us what you know about Newton's 2nd law and how you might apply it to solve this problem.
i am not understandig that problem
how can i show u work
 
  • #5
PhanthomJay
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Can you write down Newton's 2nd law?
 
  • #6
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Fnet=ma
.................
 
  • #7
PhanthomJay
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Fnet=ma
.................
Yes, correct. Now in the problem statement, you are given the acceleration and the mass of the engine and the and 6 cars. Can you solve for Fnet?
 
  • #8
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Yes, correct. Now in the problem statement, you are given the acceleration and the mass of the engine and the and 6 cars. Can you solve for Fnet?
can u do that
i don't understand
 
  • #9
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If F=ma, and you have a total mass and an acceleration.... then I'm pretty sure you can solve for F.
 
  • #10
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Fnet = menginea1 + 6mcara1

now since the pulling power of the engine (the force it can exert) is assumed to be constant,

Fnet = menginea2 + 4mCARa2
 

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