GunnerVIII

Yeah i tried something like that using mgh=1/2mv^2 - 1/2 mu^2 and it worked

Ok i have 2 questions - the first one is this: A bullet of mass 0.01kg travelling at velocity v hits a block of wood suspended on a long string. The mass of the block is 1.00kg (a) find the bullets velocity v (i've already done this using) (b) to what height does the block rise after collision? Im thinking that this is a projectile motion question Here is the second question: When u hammer a nail into a wall the nail exerts a force on the wall, and the wall exerts a force on the nail. How then does the nail penetrate the wall Any help would be great!!!

Thermaltake Volcano7+

Im not sure if this classifies as true biology, however I read somewhere that it might be possible that metallic life forms exist in some parts of the universe. I was just wondering what other people thought.

When I did this question I got an answer that seemed a little off. Im not sure if I did something wrong or this was infact the correct answer, anyway the question was: A rifle can fire a bullet at 1000ms-1. If it is fired vertically into the air, what is the maximum height reached? For how long is it in the air? I worked out that, u=1000ms-1 v=0 a=-9.8ms-2 t=? s=? I worked out the time first using v=u+at 0=1000-9.8.t and I got 102 sec I then worked out the maximum height reached using s=ut+1/2at^2 s=1000.102+1/2.-9.8.102 and I got 51,021 m Did anyone else get the same answer or have I done something wrong? Thanks