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  4. A projectile is launched from the surface of Earth with a velocity less than the escape velocity. Its total mechanical energy is

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Q. A projectile is launched from the surface of Earth with a velocity less than the escape velocity. Its total mechanical energy is

Gravitation

Solution:

The potential energy at infinity is taken as $0$.
The total minimum energy at infinity in case of the escape velocity should be $0$. If an object thrown with velocity less than escape velocity will have energy less than zero, i.e., negative.