Which of the following is required on federally-controlled waters for boats less than 39.4 feet

Gravity bc it’s gravity

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.

Sorry i don’t know what to do