Boat a and boat b have the same mass. boat a’s velocity is three times greater than that of boat b. compared to the kinetic energy of boat b, the kinetic energy of boat a is one-third as much. three times as much. six times as much. nine times as much.

Nine times

Explanation:

For this you need to be acquainted with the formula of kinetic energy:

1/2 m v^2 = Kinetic Energy

From this we see that the kinetic energy is directly proportional to mass, and directly proportional to the square of velocity.

So If you triple the velocity, the velocity will increase times as

(3v)^2

9v^2

which is nine times

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask