Can you replace the question mark with the correct number?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

Vin Diesel is pulling a theft and has planned to run away with all the cash kept in the safe. But the only way to open the safe is the 13 character password. He has a set of five clues given to him by a trustworthy source.

Exactly two of the below statements are false.
The password is contained within this sentence.
The password is not in this hint.
The password is within only one of these statements.
At least one of the above statements is a lie.

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

What English word has three consecutive double letters?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What is full of holes but still holds water?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?