1.

Assertion : If the law of gravitation becomes inverse cubelaw even then a line joining the sun the planetsweeps equal areas in equal time intervals . Reason : A planet moves in an allipticalpath .

Answer»

If both the assertion and REASON are true statement andreason is correct EXPLANATION of the assertion .
If both the assertion and reason are true statement but reason is not a correct explanation of the assertion .
If the assertion is true but the reason is a false statement.
If both assertion and reason are false statements.

Solution :Sweeping equal AREAS in equal TIME intervals is a consequence of law of conservation of angular momentum. So long as the gravitational force is Radial, no torque acts on the planetand the angular momentum in CONSERVED .
It isalso true that a planet moves in an elliptical orbit. But this notthe reason of the assertion .


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