Q: If the law of gravitation, instead of being inverse square law, becomes an inverse cube law
(a) Planets will not have elliptic orbits
(b) Circular orbits of planets is not possible
(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 sell of uniform density
Ans: (a) & (c)