tum to is quest. ko khatarnak banate hi ja rahe ho

its simple yaar..

 

see vel. dir. of rain wrt car.......

 

as thr is no vert. motion of car rain seems to come down in cars frame

but as car is moving forward it will see that the rains r going backward...

 

so net direction is south west if car is going in east dir.....

thts it. so it will hit the front and not rear