Question 1 A steel ball is dropped from a height of 100 meters. The velocity
of the ball after one second is 10 meters per second. What is the
velocity of the ball after 2 seconds?
A
10 m/sec
C
40 m/sec
B
20 m/sec
D
400 m/sec

Work = force × a. work b. energy c. distance d. momentum

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

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.)