MHT CET 2022 Physics question
A body of mass 'm' is dropped from a height , from the surface of earth where 'R' is radius of earth. It's speed when it will hit the earth's surface is ( = escape velocity from earth's surface)
Answer: (B)
Solution
The body starts from rest at a height above the surface, i.e. at distance from the centre. By energy conservation: . So
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