So...it seems as though you post each of your questions twice.
I'd have to agree w/ Apollyon in All Students - the forum is not the place to do your homework or that of your kids.
Didn't you take physics or math??? I think if you go back to the chapter, you'll find it.
You know the saying....give a man a fish, you feed him for a day...teach him to fish............
or....maybe go back to All Students since this has nothing to do with a drug - oh, unless the boat is carrying illegal drugs😛