An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet. as a result

 The correct answer is :  It happens that the mass remains the same but the weight decreases.

Explanation:  While the mass remains constant everywhere, the change in weight is due to the change occurred with gravity:

g '= g (1-2h / r)

As there is upward movement, the weight decreases because gravity decreases. Weight is inversely proportional to the square of the distance between the object and the center of the planet.

show the wavelengths of a wave. show the crests of a wave.