a 461 kg mass is sliding on a horizontal frictgitonless surface with a speed of 9.1m/s when it collides with a 85 kg mass initially at rest, as shown. the masses stick together and slide up a frictionless track at 60deg from horizontal. what is the speed of the two blocks immediatelt after the collision? the acceleration due to gravity is 9.8 m/s2. anser in units of m/s