4. In May 2010, the Japan Aerospace Exploration Agency launched IKAROS (Interplanetary Kite-craft Accelerated by Radiation of the Sun). The mass of the spacecraft was 315 kg and the area of the solar sail was 196m2. Calculate the maximum acceleration of the sail and spacecraft at a distance from the Sun equal to the Earth's orbit. Assume 90% of the incident solar energy is reflected, and 10% is absorbed in the sail