You're walking home from school and there is a sudden downpour. You immediately start running but the raindrops strike you relentlessly. You run faster... and faster... and faster. You realise that now, not so many raindrops hit you on your head, but instead, you're colliding head-on with the raindrops. As you approach the speed of light, the raindrops move slower until finally they appear frozen in time. But you still collide head-on with the raindrops.
As an example, @Yuxuan Seah and I were running to the canteen after swimming class on Thursday. Yuxuan ran with his usual rocket speed and I ran at about two-thirds of that speed. I appeared about 3 times as wet as he was :P
1) Is there an optimal speed to run when it is raining?
2) How fast would that be?
3) Would the angle of the rain falling affect this speed? Are there any other factors? (EDIT: When I said "other factors", I really didn't mean "presence of an umbrella")
4) what if it were hailing instead? Do the size of the particles matter?