ANSWER - I go up, I go down. Towards the sky & the ground. What am I?

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Question:

I go up, I go down. Towards the sky & the ground. What am I?

Options :

A train
A unicorn
  Rocket firecracker  
Gravity

ANSWER - Rocket firecracker.

Correct Answer is Updated above and Highlighted, Click only on Correct Options.
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