What information about the spring does the gradient of the graph provide?

Which is not true about oxygen-17 and oxygen-18?

Sound is a disturbance that travels through a medium as a

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.