Can you replace the question mark with the correct number in the below table sequence?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

What work can one never finish?

How can you tell a raw egg from a hard-boiled egg?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

My location can be determined by the below rebus.
So where am i ?

What is red and smells like blue paint?

Which digit occurred maximum times between the number 1 and 1000?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?