What kind of changes such as an increase/decrease in temperature or in the amount of water, landscape changes, and changes in sunlight availability, etc. that lead to adaptations?

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.