A 414 kg bear grasping a vertical tree slides down at constant velocity. The acceleration of gravity is 10 m/s 2 . What is the friction force that acts on the bear

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

conservation of mass

mass before something happens = mass afterwards