A rocket of total mass 3180 kg is traveling in outer space with a velocity of 115 m/s. To alter its course by 35.0 degrees, its rockets can be fired briefly in a direction perpendicular to its original motion. If the rocket gases are expelled at a speed of 1750 m/s, how much mass must be expelled.

Answer 1

deltamass*velocity gas= 3180*vperp

So figure the new vperp of the rocket to give a 35degree change with initial velocity 114 (tan35=Vperp/115 ?)
then figure deltamass

Answer 2

This is not correct.