Rail way car acceleration problem

[raman911]

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

 

[raman911]

help plzzzzzzzzzz

 

[PhanthomJay]

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.

 

[raman911]

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

 

[PhanthomJay]

Can you write down Newton's 2nd law?

 

[raman911]

Fnet=ma
.................

 

[PhanthomJay]

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?

 

[raman911]

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

 

[a9211l]

If F=ma, and you have a total mass and an acceleration.... then I'm pretty sure you can solve for F.

 

[xiankai]

F_net = m_enginea₁ + 6m_cara₁

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

F_net = m_enginea₂ + 4m_CARa₂