Find weight of a mass on moon? Calculate KE PE TE and Escape Velocity at earth & infinite distance?

Описание: If a person weighs 750N on Earth, how much would be his weight on the Moon given that moon's mass is 1/81 of that of the Earth and its radius is 1/3.7 of that of the Earth?

What is Gravitational potential energy?
and calculate kinetic energy, potential energy, and total energy at an infinite distance and on the surface of the earth?

Calculate the escape velocity for a spacecraft from Earth?

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