If the law of gravitation, instead of being inverse square law, becomes an inverse cube law, the...

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If the law of gravitation, instead of being inverse square law, becomes an inverse cube law, then
(a) planets will have elliptical orbits
(b) Kepler's law of areas does not hold good
(c) projectile motion of a stone thrown by hand on the surface of the earth will be approximately parabolic
(d) there will be no gravitational force inside a spherical shell of uniform density
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