82.
What would be the minimum energy required to launch a satellite of m kg from the Earth's surface in a circular orbit at an altitude of 2R? The radius of the Earth is R.

83.
Two stones of different masses are dropped simultaneously from the top of a building,

84.
The magnitude of the gravitational force will be equal to the . . . . . . . .

87.
What do the terms Geocentric and Heliocentric refer to-

90.
The Earth travels in its orbit at a speed of approx. 4,400 km per hour. Why do we not feel this high speed?

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