a boat traveling at 4m/s runs out of fuel causing the engine to turn off. Because of drag force with the water the boat immediately starts to slow down. The speed of the boat has been reduced to 2m/s 5 seconds before the engine stopped. How far did the boat travel before coming to a complete stop?

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.