A 4350 kg rocket is traveling in outer space with a velocity of 126 m/s toward the Sun. It needs to alter its course by 24.8°, which can be done by shooting its rockets briefly in a direction perpendicular to its original motion. If the rocket gases are expelled at a speed of 2240 m/s relative to the rocket, what mass of gas must be expelled? Your answer must be accurate to within 1%. um... i have like no clue how to start on this.... anyone give me a start?