Suppose a scrawny 20. kg Wyle was shot straight up with an initial velocity of +50 m/s.   a.    Assuming that all his initial Ek was transformed into Eg, what is the maximum height he could reach?

b.    Suppose that 20% of his initial Ek were lost due to friction with the air (air resistance). 
What is the maximum height he could reach?

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.)