How can I calculate the thrust if the submerged volume is not given in the problem?

What is the measure of a change in an objects velocity?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)