Q. 375.0( 1 Vote )

A particle is fired vertically upward from the earth’s surface and it goes up to a maximum height of 6400 km. Find the initial speed of the particle.

Answer :

Let the speed of the particle be and mass be .

Therefore, initial kinetic energy ,


initial potential energy of the system is


At the maximum height, the kinetic energy is zero. Therefore,


And the potential energy at a height is


From conservation of energy,







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