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1. Apr 30, 2015

### copypacer

1. The problem statement, all variables and given/known data
In April 1974, John Massis of Belgium managed to move two passenger railroad cars. He did so by clamping his teeth down on a bit that was attached to the cars with a rope and then leaning backward while pressing his feet against the railway ties. The cars together weighed 700 kN (about 71 tons). Assume that he pulled with a constant force that was 2.5 times his body weight, at an upward angle θ of 33˚ from the horizontal. His mass was 79 kg, and he moved the cars by 3 m. Neglecting any retarding force from the wheel rotation, find the speed of the cars at the end of the pull.

2. Relevant equations

Fnet = Acceleration * Mass

ax = Fcos(theta)/ M
3. The attempt at a solution
I have absolutely NO idea what to do. The professor didn't go over any problems like this DX Help!!!

2. Apr 30, 2015

### Simon Bridge

So you have never seen any problems involving a mass being accelerated by a force?

3. Apr 30, 2015

### copypacer

No D:

I tried the formula but couldn't find acceleration

4. Apr 30, 2015

### Simon Bridge

Try drawing a free body diagram for the situation - what are the forces on the train?

5. Apr 30, 2015

### SteamKing

Staff Emeritus
And, like trying to solve this problem of yours: