Asolid wood door 1.00 m wide and 2.00 m high is hinged along one side and has a total mass of 40.0 kg. initially open and at rest, the door is struck at its center by a handful of sticky mud with mass 0.300 kg kg, traveling perpendicular to the door at 11.0 m/s just before impact.

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?