Why does a rocket need to go so fast to go into space?

Answer 1

Answer #1:

the rockets need to go that fast so that it can escape the earth's gravitational pull,

so if you were on jupiter, it would have to go faster.

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Clarification #1:

There's no limit to the distance over which Earth's gravity acts.

But the faster you're going when you leave, the more time it takes for Earth's

gravity to slow you down, turn you around, and make you start falling back.

There is a certain speed at which, mathematically, the time it takes for that

to happen becomes infinite. So, even though Earth's gravity never stops pulling

to bring you back, that's the speed at which we say the rocket has 'escaped'.

Answer 2

A rocket needs to go fast to overcome Earth's gravitational pull. The faster the rocket goes, the more kinetic energy it has, which allows it to overcome gravity and reach the velocity required to go into space. Additionally, going fast helps the rocket to achieve the necessary momentum to enter and stay in orbit around the Earth or reach other celestial bodies in space.