1. The problem statement, all variables and given/known data The "Solar Sail I" experimental spacecraft is launched from the international space station with an initial velocity of 12 m/sec in a direction that makes a 120 angle with respect to the direction of radiation coming from the sun. Measurements show that an acceleration of 0.5 m/sec is imparted to the spacecraft by the pressure of sunlight pushing against its soar sail. Calculate the time taken for the spacecraft speed to increase 100 m/sec. 2. Relevant equations Vx = VoCosAo Vy = VoSinAo - gt 3. The attempt at a solution I don't get what direction the radiation is coming in, no idea where to start?