I included what i did under the pictures to make it easier to read.(adsbygoogle = window.adsbygoogle || []).push({});

but im not sure, with the ski questoin, if v= root(2gd) thats somthing i pulled out of my text book, and if d is 20 or the distance of the slope.

but if thats all right my next worry is that i shouldnt of solved it as a projectile, i found the range of the jump, found the time it took to reach the range, then halved the time to find when the skier was at max height. and got 4.4m or somthing

is there any other way to convert kinetic / potential energy to a velocity?

my tutor did somthing with the KE formula, he differentiated it, then v turned into a and he intergrated it, but im not 100% what he did.

I'm pretty confident with the neutron question because it seems right having the particle with the smaller angle having a higher velocity.

But thanks to anyone who has a look

[PLAIN]http://img199.imageshack.us/img199/8657/eeebb.jpg [Broken]

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# Potential energy and momentum question

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