A fighter jet lands on the deck of an aircraft carrier. It touches down with an initial velocity of 70.4 m/s and comes to a complete stop over a distance of 197.4 m. What is the acceleration needed to completely stop this jet? How much time it would take the jet to stop?

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)