a. Due to air resistance, raindrops fall at a constant velocity v perpendicular
to the ground surface. How is it necessary to position a cylindrical bucket on
a platform moving at a speed of u so that drops do not fall on its walls?
b. At a wind speed of 10 m, raindrops fall at an angle of 30◦ to the vertical. At
s
what wind speed will the drops fall at an angle of 45◦ ?