A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The car moves horizontally with a speed of 2 m/. At what angle α with the vertical should the wind screen be placed so that the rain drops falling vertically downwards with velocity 6 m/ strikes the wind screen perpendicularly?
Let vertical direction limit vector be j , horizontal i
Hence wind stream is inclined at tan-13° with vertical.
