A dog of mass Md is standing on a raft so that he is a distance xdgi = L from the shore. He walks a distance Δxdb = d on the boat toward the shore and then stops. The boat has a mass of Mb. Assume no friction between the boat and the water. How far is the dog from shore when he stops moving?

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600