Question

what is gravitational potential,escape velocity,orbital velocity?

Answer 1

The gravitational potential (V) is the gravitational potential energy (U) per unit mass: where m is the mass of the object. Potential energy is equal (in magnitude, but negative) to the work done by the gravitational field moving a body to its given position in space from infinity.
In physics, escape velocity is the minimum speed needed for an object to escape from the gravitational influence of a massive body. The escape velocity from Earth is about 11.186 km/s (6.951 mi/s; 40,270 km/h; 25,020 mph) at the surface.
Orbital Velocity Formula. Objects that travel in uniform circular motion around the Earth are said to be "in orbit". The velocity of this orbit depends on the distance from the object to the center of the Earth. ... 2) A satellite is orbiting the Earth with an orbital velocity of 3200 m/s.

Answer 2

Gravitational force is the force that pulls us towards the centre of earth. With help of gravitational force we are standing upright. If there will be no gravity then everything will loaf in the air. THANK YOU