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## Homework Statement

A train consisting of two cars pulled by a locomotive experiences an acceleration of 0.33m/s^2 [fwd]. Friction is negligible. Each car has a mass of 3.1 * 10^4 KG.

a. ) Determine the force exerted by the first car on the second car.

b. ) Determine the force exerted by the locomotive on the first car.

## Homework Equations

Applying Newtons third law of motion which states:

for every action force, there is a simultaneous force equal in magnitude, but opposite in direction

## The Attempt at a Solution

I drew a FBD of the situation and solved for part a) by simply applying Newtons second law equation [ F= mA ]

I solved for F and got 1.0 * 10^4 N.

However I have trouble solving for part b.)

The answer is supposed to be 2.0 * 10^4 N, but I can't get it.

Would appreciate any help/advice!

Many thanks in advance.