GunnerVIII Posted March 11, 2003 Share Posted March 11, 2003 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 Link to comment Share on other sites More sharing options...
greg1917 Posted March 11, 2003 Share Posted March 11, 2003 yeah. different ways to do it. since v^2 = u^2 + 2as you can rearrange to give s = (v^2 - u^2) / 2a which gives 51020m which is close enough to ure figure. and yeah v = u + at which gives t as 102s. Link to comment Share on other sites More sharing options...
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