I actually have no idea what I’m doing and I’m going to fail this class please help

What is the final velocity of the initial velocity of 25 and -50?

If steel is more dense that lake water, why can a boat float

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?