1. The problem statement, all variables and given/known data A small rocket of mass 1ton is moving horizontally with a velocity of 600 m/s in the x direction.The total force on the rocket is zero.10 kg of jet gas is ejected at a velocity (in the x direction) of -6000 m/s with respect to the ground.The ejection takes place over a time interval of 1 second. a) What is the velocity of the rocket after the jet gas is ejected? b) What is the force (vector) that the jet exerts on the rocket during the ejection? 2. Relevant equations P=m.v and the conservation of momentum 3. The attempt at a solution i dont know what to do because of the given statement "The ejection takes place over a time interval of 1 second". So i would be glad if you can clarify this mathematically and help me to add it into the equation about the conservation of momentum.(think its something to do with derivative)?