Which one of the following statements is not true? Gravitational force is always

Question

Which one of the following statements is not true? Gravitational force is always attractive. Orbit speeds of the satellites decrease with the increasing height. Periods of the satellites increase with the increasing height. Gravitational acceleration of a planet decreases with the increasing height. Escape speed from the planet is greater for a projectile fired at 45 degree, than for a projectile fired vertically up. A planets on the elliptical orbit has the greatest speed at the point closest to the Sun.

Explanation / Answer

In the given options all are correct except option ( E )

Because, the angle of projection does not affect the values of escape velocity, it does effect the path of projectile only. Thus, the correct option is ( E )

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