Hi everyone. I have some simple momentum problems I am having trouble solving. Please help me. A 54.0 kg dancer leaps 0.33 m high. With what momentum does the dancer reach the ground? Well, I tried the momentum formula: p=mv. I plugged in 54.0 kg for the mass, and the velocity I put in 9.8 but of course this is wrong. I don't know how to get the velocity for a falling object (very embarassing!). Anyways, does anyone know how to get the velocity of a falling object if they jump .33 m high like in the problem so I can get the momentum? Thanks. Here is another problem I am having trouble with: A space probe with a mass of 7.630 103 kg is traveling through space at 110 m/s. Mission control decides that a course correction of 30.0° is needed and instructs the probe to fire rockets perpendicular to its present direction of motion. If the gas expelled by the rockets has a speed of 3.200 km/s, what mass of gas should be released? Well, I'm not even sure which equation to use and how to do it. I tried a few equations including mv=mv+MV and then mv=MV, trying to solve for M, but it is wrong everytime. Does the 30 degrees have anything to do with it? Can anyone help? Thanks.