I make two people out of one. What am I?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

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.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

What can you catch but never throw?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

what one word does the below rebus identifies?