Help with physics before exam :)

[aaronmyung]

Hey guys

I have this question that I am having trouble answering. Any help you could give me would be really great.

 

A cannon of mass 1.0x10^5kg fires a 500kg shell horizontally, imparting to it a speed of 1.0x10^3 ms^-1. Find the work done on the cannon by the expanding gases (assuming that it is free to move).

 

Any assistance would be greatly appreciated. I haven't been doing physics for that long but I'm already finding it really interesting.

 

That question was on a set of revision sheets I got before the exam I have next week (which counts towards my exit mark, which will determine what I can study in uni ... I feel like I'm getting old).

 

Thanks for your time guys!

[swansont]

Hey guys

I have this question that I am having trouble answering. Any help you could give me would be really great.

 

A cannon of mass 1.0x10^5kg fires a 500kg shell horizontally' date=' imparting to it a speed of 1.0x10^3 ms^-1. Find the work done on the cannon by the expanding gases (assuming that it is free to move).

 

Any assistance would be greatly appreciated. I haven't been doing physics for that long but I'm already finding it really interesting.

 

That question was on a set of revision sheets I got before the exam I have next week (which counts towards my exit mark, which will determine what I can study in uni ... I feel like I'm getting old).

 

Thanks for your time guys! [/quote']

 

Since there are no external horizontal forces on the system, the momentum in that direction is conserved.