A child's toy consists of a small wedge that has an acute angle of 28 degrees. The sloping side of the wedge is frictionless, and the wedge is spun at a constant speed by rotating a rod that is firmly attached to it at one end. The acceleration of gravity is 9.8 m/s^2. When the mass of 78g rises up the wedge a distance 82 cm and stays there, what is the speed of mass? answer in units of m/s.