A rock is dropped from high above the surface of the Earth. The initial speed is 0, and the initial height above the surface is NxRg where Rg is the radius of the Earth. Calculate the speed of the rock when it hits the upper atmosphere, say at height 20 km above the surface. DATA for the Earth: radius Rg = 6.38 x 10 m; mass M = 5.98 x 1024 kg. N = 9; (in m/s) OA: 7.258x103 OB: 1.052x104 OC: 1.526x104 OD: 2.213x104 OE: 3.208x104 OF: 4.652x104 OG: 6.746x104 OH: 9.781x104
Gravitational force
In nature, every object is attracted by every other object. This phenomenon is called gravity. The force associated with gravity is called gravitational force. The gravitational force is the weakest force that exists in nature. The gravitational force is always attractive.
Acceleration Due to Gravity
In fundamental physics, gravity or gravitational force is the universal attractive force acting between all the matters that exist or exhibit. It is the weakest known force. Therefore no internal changes in an object occurs due to this force. On the other hand, it has control over the trajectories of bodies in the solar system and in the universe due to its vast scope and universal action. The free fall of objects on Earth and the motions of celestial bodies, according to Newton, are both determined by the same force. It was Newton who put forward that the moon is held by a strong attractive force exerted by the Earth which makes it revolve in a straight line. He was sure that this force is similar to the downward force which Earth exerts on all the objects on it.
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