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A satellite of mass 5M orbits the earth ...

A satellite of mass `5M` orbits the earth in a circular orbit. At one point in its orbit, the satellite explodes into two pieces, one of mass `M` and the other of masses `4M`. After the explosion the mass `M` ends up travelling in the same circular orbit, but in the opposite direction. After explosion the mass `4M` is

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PHYSICS GALAXY - ASHISH ARORA-GRAVITATION-Unsolved Numerical
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