1. The problem statement, all variables and given/known data [PLAIN]http://img714.imageshack.us/img714/8184/rocketj.png [Broken] I am not sure if the problem has enough information to find. However, i tried some of the works. g=10m/s2( i use gravity as 10 .) 2. Relevant equations No idea... 3. The attempt at a solution I am thinking this formula F = ma to find the thrust. so my first plan is to find the a(in xy direction) and then get the Force. (not sure if this is a right attempt) So, t=(2(275)/10) = 7.4 sec V(in y dir) = (2(275)(10))^.5 = 74m/s V(in xy dir) = 74/sin(85) = 74m/s a(in xy dir)= 74/(7.4*2) =5.3m/s2 (I am pretty sure this part is wrong) F = ma F= (26/1000)kg * 5.3 m/s2 = 0.1219 N ( Doesn't make sense lol ) I am new to Physics. So, yea, i am still confusing with some stuffs. Thanks in advanced for helping me.