Help!! A force changes the velocity of a body from 10m/s to 20m/s in 5 second. if the body has s mass of 5kg, what is the work done by the force in 4 second and the work done during the fourth second?

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is