A 2.0kg mass is attached to a massless spring with a force constant of 20N/m. The spring is stretched to 0.3m in length from its equilibrium position and released. What is the total energy and frequency of oscillation according to classical calculations

Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision. give the answer in m/s. describe the work you did to get the answer.