A 0.1-kilogram baseball is thrown in a straight line at a velocity of 20 m/sec. What is the momentum of the baseball?

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

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.)

When doing scientific research ,the sources used should be ?