sir, when we give escape velocity to a projectile,

Question

sir, when we give escape velocity to a projectile, it escapes the earth...so if we give 3 times of velocity to a projectile ,then at infinity its velocity decreases to 2*1.414 times of escape velocity(,when we neglect sun and other planet’s gravitation force...)so my question is that because we are neglecting other forces then why there is change in velocity because as newton’s 1 law states that until an external force is applied there is no change in motion of body.

Aziz Alam · Accepted Answer

The change in velocity of projectile from v=3veto v=2.828vebecause of the gravitational field of earth. We have ignored all the forces due to all planets and sun, but we have only considered the force of attraction of Earth. It is because of constant earth&rsquo;s pull that there is fall in velocity of projectile.

General Physics> sir, when we give escape velocity to a pr...

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General Physics> sir, when we give escape velocity to a pr...

RahulBhardwaj , 10 Years ago

Aziz Alam

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