A boat of `90 kg` is floating in still water. A boy of mass 30 kg walks from the stern to the bow. The length of the boat is 3 m. Calculate the distance through which the boat will move.

A boat of mass 90 kg is floating in still water. A boy of mass 30 kg walks from one end to the other on it. If the length of the boat is 3 m, then the distance through which the boat will move is

A boat of mass 80 kg is floating on still water. A dog of mass 20 kg on the boat is at a distance of 10 m from the shore. The dog moves on the boat by a distance of 2m towards the shore. The distance of the dog from the shore is